Leo, Thanks for all your help. I just checked for voltage at the back of the guages, with everything plugged in, and the key in the run position . I have voltage on both the temp and fuel guage. So knowing there is power to the guages, does this narrow my search down to a ground..----- Original Message ----- From: "Leo John Costigan" <nagit...@comcast.net> To: "The Chevelle Mailing List" <chevelle-list@chevelles.net> Sent: Tuesday, February 2, 2010 9:51:22 PM GMT -05:00 US/Canada Eastern Subject: Re: [Chevelle-list] wiring question
Bob, Jim is right. With the cluster plug connected to the cluster and Ign switch in run, you should have 12v when you disconnect the plug at either the temp sender or fuel sender. If you don’t, then there is an open somewhere between the gauge fuse and the sender plugs. You can use a test light and disconnect the sender plugs and connect the test light to these connectors. The light should light but it will be dim. As for grounding; You should ground the engine to the frame and to the body. You should ground the body to the frame. The cluster should be grounded to the dash frame. The headlight should be grounded to the cluster by a shorting strap. The fuel tank should be grounded to the frame. All of these grounds need to be in place to eliminate any grounding loops. Bad grounds will give bad readings and can cause you to go around in circles. You did indicate that your gauges never did work. My 70 El Camino had a problem that was caused by the amp meter wires had melted in the dash harness. There was no indication of a problem except that the amp didn’t move. The outside of the harness looked good. I found the problem when install a TPI engine and rewired the harness for the computer and upgrade for glass fuse to ATO. Several of the wires were melted together. These old original harness are in bad shape. Do check the grounds. Leo ----- Original Message ----- From: rml...@comcast.net To: The Chevelle Mailing List Sent: Tuesday, February 02, 2010 4:53 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
