Thanks Chum, I think I going to buy some new guages. The fuel guage will not move off empty, regardless of what I do. And the temp. guage wont respond either. Thanks again. Bob ----- Original Message ----- From: "Chum Nault" <c...@jimolsonmotors.com> To: "The Chevelle Mailing List" <chevelle-list@chevelles.net> Sent: Saturday, February 13, 2010 1:02:35 PM GMT -05:00 US/Canada Eastern Subject: Re: [Chevelle-list] wiring question
If you have voltage on the tan wire and you ground the tan wire and the gauge doesn’t go to empty you have a bad gauge. The fuel gauge is nothing more than an ohm meter and the sending unit is a 90 ohm variable resistor. If you want to make sure, ground the sending unit side of the gauge right at the dash that will eliminate the wiring to the sending unit and the gauge should go to empty. I doubt if it has a wiring problem because you have voltage at the tan wire. You can also substitute an ohm meter for the fuel gauge to test the sending unit and wiring 0 ohms will be empty 90 ohms will be full. I hope this helps, I have seen some good technicians confused by fuel gauge problems so you are not alone. Chum Nault From: chevelle-list-boun...@chevelles.net [mailto:chevelle-list-boun...@chevelles.net] On Behalf Of rml...@comcast.net Sent: Saturday, February 13, 2010 11:31 AM To: The Chevelle Mailing List Subject: Re: [Chevelle-list] wiring question I can not seem to figure out how to unplug the fisher body connector that is in front of the fuse box. Iam not seeing the lock tab. I want to see if I can get any movement out of my fuel guage. I've tried everythig. I have voltage to the guage, I have voltage to the tan wire in the trunk. I've dissconnected and grounded the tan wire. I even ran a ground wire directly from the battery to the back of the fuel guage. besides buying new guages, does anyone have any other ideas. Thanks. ----- Original Message ----- From: rml...@comcast.net To: "The Chevelle Mailing List" <chevelle-list@chevelles.net> Sent: Monday, February 8, 2010 8:09:28 PM GMT -05:00 US/Canada Eastern Subject: Re: [Chevelle-list] wiring question Leo as you suggested I ran a ground wire directly from the battery to the cluster. I disconnected the sending unit wire from the guage in the trunk and grounded it. I then made sure I had voltage at the guage with the key in the run position. I checked continuity from the cluster to the fire wall. And I still didn't get any movement from the guage. I'm not so sure Iam ready to cut my harness open yet. Are you sure I should do that. Everything in the dash has power when it's supposed to. Thank you once again. Bob ----- Original Message ----- From: "Leo John Costigan" nagit...@comcast.net To: "The Chevelle Mailing List" <chevelle-list@chevelles.net> Sent: Monday, February 8, 2010 4:44:42 PM GMT -05:00 US/Canada Eastern Subject: Re: [Chevelle-list] wiring question At this point before I would buy new gages I would split the dash harness between the cluster plug and fuse box and check for melted or shorted wires. Also I would recheck all grounds to cluster and maybe run a direct ground from the battery to the cluster, straight wire. With the sending unit plugs disconnected and then shorted to ground you should have some type of movement in the gage. If there were a short or open in the harness nothing would change by removing the plugs from the senders. Leo ----- Original Message ----- From: rml...@comcast.net To: The Chevelle Mailing List Sent: Monday, February 08, 2010 12:49 PM Subject: Re: [Chevelle-list] wiring question I have voltage at my guages, and I have voltage on the lines to my sending units ie. temp. and fuel. I disconnected the plug in the trunk and checked for voltage which tested ok. However when I unplugged it my guage didn't respond by going to full. Iam thinking maby I need new guages. I did the same with the temp. I checked for voltage by disconnecting the line at the temp. sending unit and got a voltage reading. However, the guage didn't respond to being disconnected or grounded. Do yall think maby I need new guages.Thanks to you all for all your help. ----- Original Message ----- From: 327mal...@gmail.com To: "The Chevelle Mailing List" <chevelle-list@chevelles.net> Sent: Sunday, February 7, 2010 10:37:50 AM GMT -05:00 US/Canada Eastern Subject: Re: [Chevelle-list] wiring question I don't know if this will help you but give it a look. The Chevelle Engineer http://chevelleengineer.home.comcast.net/~chevelleengineer/fuelgage.htm ----- Original Message ----- From: rml...@comcast.net To: The Chevelle Mailing List Sent: Tuesday, February 02, 2010 7:53 PM Subject: Re: [Chevelle-list] wiring question Jim I appriciate your help. It seems to me Iam being told 2 different things here. Leo say's there should be no power at pins 10 and 11 and it sounds to me like your telling me there should be power at those pins. I dont understand the principles of operation here. I dont understand how they work.I hope someone here can explain to me exactly how it works. Does 12 volts go through the guage and the sending units add resistance to ground. Thanks every body for your help here. I just wanna get my guages working. ----- Original Message ----- From: "Jim Thompson" jimthompso...@gmail.com To: "The Chevelle Mailing List" <chevelle-list@chevelles.net> Sent: Tuesday, February 2, 2010 7:10:29 PM GMT -05:00 US/Canada Eastern Subject: Re: [Chevelle-list] wiring question I will suggest again that ground is critical. Your fuel sending unit should have its own ground wire. The temp sending unit is hot, internally the switch closes to ground. With the key to “on” both should be hot. Your fuse box should have one fuse marked “gauges” if it is hot on both sides. Then it is a ground issue or short in the gauge harness. From: chevelle-list-boun...@chevelles.net [mailto:chevelle-list-boun...@chevelles.net] On Behalf Of rml...@comcast.net Sent: Tuesday, February 02, 2010 4:25 PM To: The Chevelle Mailing List Subject: Re: [Chevelle-list] wiring question Does anyone know where the voltage for the fuel and temp. guages is fed from. I have voltage to everything except these two guages. I unplugged the 12 pin connector that plugs into the pcb and checked for voltage there. everything is hot with the exception of temp and fuel. all my fuses are good. Any ideas.Thanks, Bob ----- Original Message ----- From: dhoesc...@granitecityperformance.com To: "The Chevelle Mailing List" <chevelle-list@chevelles.net> Sent: Monday, February 1, 2010 10:03:58 PM GMT -05:00 US/Canada Eastern Subject: Re: [Chevelle-list] wiring question I would suggest disconnecting the tan fuel sender feed wire at the fuel tank. Turn the key to RUN position and wait a few moments (some gauges are slow) with the tan wire disconnected the fuel gauge should read past full. Then ground the tan wire anywhere to the body and the gauge should read empty. If you get no response then you have a bad gauge or a wiring problem. -----Original Message----- From: "Tom Rightler" <bluess...@comcast.net> Sent: Monday, February 1, 2010 20:47 To: "'The Chevelle Mailing List'" <chevelle-list@chevelles.net> Subject: Re: [Chevelle-list] wiring question If you want to check the gauges, send 12 volts directly to them and see if the needle moves. If the needle moves, the gauges is good and there are wiring issues elsewhere. I’ve seen brand new sending units fail. There should be 12 volts at the bulkhead connector with the key in the run position for all wiring to the gauges. Tom -----Original Message----- From: chevelle-list-boun...@chevelles.net [mailto:chevelle-list-boun...@chevelles.net] On Behalf Of rml...@comcast.net Sent: Monday, February 01, 2010 9:01 PM To: The Chevelle Mailing List Subject: Re: [Chevelle-list] wiring question The sending. unit is grounded to the body, and the temp sending unit is new. Tom,do you know if there would or should be voltage at the 12 point connection into the pcb. for the temp and fuel guages ----- Original Message ----- From: "Tom Rightler" <bluess...@comcast.net> To: "The Chevelle Mailing List" <chevelle-list@chevelles.net> Sent: Monday, February 1, 2010 8:53:30 PM GMT -05:00 US/Canada Eastern Subject: Re: [Chevelle-list] wiring question Is the fuel sending unit grounded to the body? If the temp gauge isn’t working, it’s usually a problem with the sending unit screwed into the head. Tom Rightler MCC Newsletter Editor http://www.chevelles.net/mcc -----Original Message----- From: chevelle-list-boun...@chevelles.net [mailto:chevelle-list-boun...@chevelles.net] On Behalf Of rml...@comcast.net Sent: Monday, February 01, 2010 8:32 PM To: The Chevelle Mailing List Subject: Re: [Chevelle-list] wiring question I'am a firm beliver that there is no such thing as a dumb question. My dash lights are working fine. the dimmer switch is working I just dont have a temp. guage or a fuel guage. ----- Original Message ----- From: dhoesc...@granitecityperformance.com To: "The Chevelle Mailing List" <chevelle-list@chevelles.net> Sent: Monday, February 1, 2010 8:25:13 PM GMT -05:00 US/Canada Eastern Subject: Re: [Chevelle-list] wiring question Forgive me if it's a dumb question...did you try rotating the knob? I don't know if 1970 had the "dimmer" built into the headlight switch perhaps it's turned down to the lowest setting or the rheostat is burnt out? Second, did you check for power at the fuse? -----Original Message----- From: rml...@comcast.net Sent: Monday, February 1, 2010 19:08 To: "The Chevelle Mailing List" <chevelle-list@chevelles.net> Subject: Re: [Chevelle-list] wiring question Yes I do have a schematic. I have a 70 ss with guages. Iam just not sure why the guages are not working. ----- Original Message ----- From: dhoesc...@granitecityperformance.com To: "The Chevelle Mailing List" <chevelle-list@chevelles.net> Sent: Monday, February 1, 2010 7:27:55 PM GMT -05:00 US/Canada Eastern Subject: Re: [Chevelle-list] wiring question Do you have a wiring schematic -or- would it help if you had one? What year Chevelle do you have? -----Original Message----- From: rml...@comcast.net Sent: Monday, February 1, 2010 17:02 To: dansolo...@msn.com, "The Chevelle Mailing List" <chevelle-list@chevelles.net> Subject: Re: [Chevelle-list] wiring question Dan, The guages are not new nor is the engine harness or the dash harness. And no the guages did not work before. I was hoping that putting a new pcb. in would get them working. All the wiring is still original to the car. I did put voltage to the gas guage when I had it on the bench and was able to get movement. I used a 9 volt battery and the guage moved to around 1/2 tank. I then reversed the polarity and the guage went back to E. So with that said I kinda assumed the guages were o k. I really appriciate your efforts, Keep pitching maby eventually I'll get a hit. Thanks Bob ----- Original Message ----- From: "Dan Solomon" <dansolo...@msn.com> To: "Chevelle List" <chevelle-list@chevelles.net> Sent: Monday, February 1, 2010 5:34:52 PM GMT -05:00 US/Canada Eastern Subject: Re: [Chevelle-list] wiring question Are the gauges new? How about the dash harness and the engine harness? Did the gauges work before you made your changes? The reason I ask is that the pins are in different locations at the firewall. If one harness is from a 70 and one from a 71-72 that may cause your problem. Thanks, Dan -------------------------- Sent using BlackBerry From: rml...@comcast.net Date: Mon, 1 Feb 2010 21:54:45 +0000 (UTC) To: <dansolo...@msn.com>; The Chevelle Mailing List<chevelle-list@chevelles.net> Subject: Re: [Chevelle-list] wiring question Dan, I did ground the cluster with one of the screws that attach the metal to the plastic housing. And all my lights are working, dash lights, head lights, but none of my guages are working. Fuel, temp, or amp. All of my fuses are good. Any ideas. Thanks Bob ----- Original Message ----- From: "Dan Solomon" <dansolo...@msn.com> To: "Chevelle List" <chevelle-list@chevelles.net> Sent: Monday, February 1, 2010 4:41:31 PM GMT -05:00 US/Canada Eastern Subject: Re: [Chevelle-list] wiring question Bob, I don't remember if all of the wires in the connector are hot but you do need ground to the cluster. Use one of the screws that attach the metal cover to the plastic housing. Don't use the ones that attach the PCB. When you say your lights are working do you mean dash lights or headlights? Thanks, Dan -------------------------- Sent using BlackBerry From: rml...@comcast.net Date: Mon, 1 Feb 2010 20:56:09 +0000 (UTC) To: The Chevelle Mailing List <chevelle-list@chevelles.net> Subject: Re: [Chevelle-list] wiring question Thanks, Dan. Should I have a voltage at each pin on the 12 pin connector.ie.the fuel, temp, and amp. My lights are working, I didn't put a ground on the guage cluster itself. can that go on any screw on the back of the cluster. All the screws on the back go through the pcb. ----- Original Message ----- From: "Dan Solomon" <dansolo...@msn.com> To: "The Chevelle Mailing List" <chevelle-list@chevelles.net> Sent: Monday, February 1, 2010 10:04:44 AM GMT -05:00 US/Canada Eastern Subject: Re: [Chevelle-list] wiring question I had a hell of a time with the dash in my 70. Must have pulled it out and put it back in 6 times. Make sure that you have the three black ground wires hooked up. One goes to a screw on the cluster, one to the metal frame of the dash carrier and one to the e-brake. Also did you put the ground strap back in under the light switch? My problem turned out to be the headlight switch. Power to the cluster passes through this switch. One of the spades slipped out aside the connector and was not making contact. Here is the topic on chevelles.com. It has some great pics and information to diagnose the headlight switch. It also includes information on the 12 pin connector and tests to verify voltage at the fusebox. http://www.chevelles.com/forums/showthread.php?t=260728&highlight=hot+wires+SS+dash Dan "It is a mistake to allow any mechanical object to realize you are in a hurry." http://www.freewebs.com/chevelles1970/ Date: Mon, 1 Feb 2010 10:06:28 +0000 From: rml...@comcast.net To: Chevelle-list@chevelles.net Subject: [Chevelle-list] wiring question I set my restored dash in place and connected the wires, turned the key to acess. and my temp. fuel, and amp guages did nothing. Should there be a voltage at the 12 point plug for each of these three guages. My dash lights work. Turn signals work. brake lights. All the lights are working. Iam stumped. Any ideas,Thanks. Frustrated. No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.733 / Virus Database: 271.1.1/2662 - Release Date: 02/01/10 07:37:00 No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.733 / Virus Database: 271.1.1/2662 - Release Date: 02/01/10 07:37:00
