Re: [MBZ] Glow plug problem
Sounds as if you have been converted to parallel glow plugs, and have one out or a blown fuse. There is a fuse on the firewall in a small box on the later series glow plugs systems, and I think it stays in place with the parallel converstion. Peter
Re: [MBZ] Glow plug problem
Thanks Peter, I saw that box on the firewall and then saw a picture of it on Performance Products website, where it was labeled as glow plug fuse box or something like that. Because this happened suddenly and it acts differently than when plugs were bad, I am leaning toward fuse or relay. Fellow lister John Peterson and I will attack this on Saturday if the deep freeze lifts. Good news is that the 300D 2.5 seems to start so easy in cold weather that it's not a worry. I have never even plugged in the block heater on that. Dwight Dwight E. Giles, Jr. 1979 240D-250K + miles 1990 300D 2.5t 135K miles Wickford, RI -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Peter Frederick Sent: Tuesday, March 06, 2007 9:02 PM To: Mercedes Discussion List Subject: Re: [MBZ] Glow plug problem Sounds as if you have been converted to parallel glow plugs, and have one out or a blown fuse. There is a fuse on the firewall in a small box on the later series glow plugs systems, and I think it stays in place with the parallel converstion. Peter ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] Glow plug problem
So-it had new glow pugs two years ago-they don't have the toaster wires but have red insulated wire running between them-sure looks like series to me-given my limited knowledge of electricity. I looked for fuse-don't se any listed. With regular insulated wires, it's likely you have a converted parallel system. If you had series plugs wired up without the toaster racks they'd probably last for one or two starts before burning up. Think of what regular light bulbs do on 220V! But, I am wondering- is it the relay? Or a GP failure? Why is the dash light coming on when I start it and not on glow? The light is often driven as a diagnostic measure. But, without knowing _exactly_ what circuit you have (and conversions are always problematic this way) it's difficult to tell. Fortunately the electrical diagnosis is fairly easy, for those who know how to do it. Step one is to see if your plugs are getting any juice or not. -- Jim
Re: [MBZ] Glow plug problem
Thanks Jim I think you are right-I have a converted parallel system. Will start with that separate fuse box on the firewall. Weekend project when it warms up. Dwight Jim Cathey [EMAIL PROTECTED] wrote: So-it had new glow pugs two years ago-they don't have the toaster wires but have red insulated wire running between them-sure looks like series to me-given my limited knowledge of electricity. I looked for fuse-don't se any listed. With regular insulated wires, it's likely you have a converted parallel system. If you had series plugs wired up without the toaster racks they'd probably last for one or two starts before burning up. Think of what regular light bulbs do on 220V! But, I am wondering- is it the relay? Or a GP failure? Why is the dash light coming on when I start it and not on glow? The light is often driven as a diagnostic measure. But, without knowing _exactly_ what circuit you have (and conversions are always problematic this way) it's difficult to tell. Fortunately the electrical diagnosis is fairly easy, for those who know how to do it. Step one is to see if your plugs are getting any juice or not. -- Jim ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com -- Dwight E. Giles, Jr. Bissell Cove Quahog Auto Salvage Co. Wickford, RI
[MBZ] Glow plug problem
I seem to have had a failure on eh GP system on the 240D today. Stared fine early this AM at 4F with double glow, half-pedal etc. About 3 hours later when I came out of my morning meeting , no glow light came on when I turned the key-so assuming that the engine was warm enough (at 12F-duh) I turned the key to the starter position-glow plug light came on as starter turned and car started hard-obviously no pre glow. Happened again this afternoon. So-it had new glow pugs two years ago-they don't have the toaster wires but have red insulated wire running between them-sure looks like series to me-given my limited knowledge of electricity. I looked for fuse-don't se any listed. So until lit warms up and I can mess with it, I will drive the 300D. But, I am wondering- is it the relay? Or a GP failure? Why is the dash light coming on when I start it and not on glow? I am sure this is in the archives-I did RTFM -Haynes and didn't get much guidance. TIA Dwight Dwight E. Giles, Jr. 1979 240D-250K + miles 1990 300D 2.5t 135K miles Wickford, RI
Re: [MBZ] glow plug problem
Andrew Cunningham wrote: P.S. Just joking... Can't you disconnect all of them and wire them one at a time and see which one is drawing all that juice? Yeah, unplug the harnes at the relay, and run battery positive through an ammeter to the pins in the connector one at a time.
Re: [MBZ] glow plug problem
Im 99% sure I have 80A fuses. I will doublecheck though. The so if I had a shorted plug it should read less resistance than the others? All of mine read the same. Which I believe was 1 ohm, can that be right? I think even new plugs I tested read 1 ohm Marshall Booth wrote: Kaleb C. Striplin wrote: On one of my SDL's I noticed it blew the glow plug fuse. I replaced it, turned key on, it blew again. I checked all the glow plugs and found one that was physically broken. I replaced it, same thing, blew fuse again. I checked all the plugs again and the resistance on all of them was the same. None checked bad with that test. So for the time being I installed a heavy wire in place of the fuse. This wire does heat up while the glow plugs are running. So whats the deal? Could a glow plug be shorted? How would I check that? I dont see any wires that look bad. Am I correct in assuming the problem is between the relay and the plugs, or the lines connecting the 2? Would a shorted plug show good on a resistance test? Could be a shorted plug (that will result in a resistace reading of below 0.5 ohms, but to most meters, that's not much different than 0.5 ohms), a shorted wire to the plug, or that you got some 30 or 50 A fuses rather than 80 A. Marshall -- Kaleb C. Striplin/Claremore, OK 89 560SEL, 87 300SDL, 87 300SDL, 85 380SE, 85 300D, 81 300TD, 81 240D, 81 240D, 76 240D, 76 300D, 74 240D, 69 250 Okie Benz Auto parts-email for used parts
Re: [MBZ] glow plug problem
Kaleb A plug can short. If you disconnect all the plugs and then measure to see how much each draws with an ammeter you'll find the shorted one. I don't know if the SDL has more than 80 amps for a fuse but whatever it is divide that by 6 and each plug shuld draw less than that. hank - Original Message - From: Kaleb C. Striplin [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Sunday, June 12, 2005 9:34 PM Subject: [MBZ] glow plug problem On one of my SDL's I noticed it blew the glow plug fuse. I replaced it, turned key on, it blew again. I checked all the glow plugs and found one that was physically broken. I replaced it, same thing, blew fuse again. I checked all the plugs again and the resistance on all of them was the same. None checked bad with that test. So for the time being I installed a heavy wire in place of the fuse. This wire does heat up while the glow plugs are running. So whats the deal? Could a glow plug be shorted? How would I check that? I dont see any wires that look bad. Am I correct in assuming the problem is between the relay and the plugs, or the lines connecting the 2? Would a shorted plug show good on a resistance test? -- Kaleb C. Striplin/Claremore, OK 89 560SEL, 87 300SDL, 87 300SDL, 85 380SE, 85 300D, 81 300TD, 81 240D, 81 240D, 76 240D, 76 300D, 74 240D, 69 250 Okie Benz Auto parts-email for used parts Looking for quality used parts? We are parting out several 108, 109, 114, 115, 116, 123, and 126 chassis Mercedes-Benz. Email [EMAIL PROTECTED] for requests. ___ Need new parts? Check out out Rusty at www.buymbparts.com for your best deal on new parts. ___ Mercedes mailing list [EMAIL PROTECTED] http://striplin.net/mailman/listinfo/mercedes_striplin.net
Re: [MBZ] glow plug problem
Kaleb, I'm not much with electrical stuff, but I do know this: If one plug broke, and another is shorted, and assuming they are all about the same age, why not replace them all and be done with it for a while. Otherwise, the one that is about to break will do the same thing in a few months, etc. Chris K Cayce, SC On one of my SDL's I noticed it blew the glow plug fuse. I replaced it, turned key on, it blew again. I checked all the glow plugs and found one that was physically broken. I replaced it, same thing, blew fuse again. I checked all the plugs again and the resistance on all of them was the same. None checked bad with that test. So for the time being I installed a heavy wire in place of the fuse. This wire does heat up while the glow plugs are running. So whats the deal? Could a glow plug be shorted? How would I check that? I dont see any wires that look bad. Am I correct in assuming the problem is between the relay and the plugs, or the lines connecting the 2? Would a shorted plug show good on a resistance test? -- Kaleb C. Striplin/Claremore, OK 89 560SEL, 87 300SDL, 87 300SDL, 85 380SE, 85 300D, 81 300TD, 81 240D, 81 240D, 76 240D, 76 300D, 74 240D, 69 250 Okie Benz Auto parts-email for used parts Looking for quality used parts? We are parting out several 108, 109, 114, 115, 116, 123, and 126 chassis Mercedes-Benz. Email [EMAIL PROTECTED] for requests. ___ Need new parts? Check out out Rusty at www.buymbparts.com for your best deal on new parts. ___ Mercedes mailing list [EMAIL PROTECTED] http://striplin.net/mailman/listinfo/mercedes_striplin.net Looking for quality used parts? We are parting out several 108, 109, 114, 115, 116, 123, and 126 chassis Mercedes-Benz. Email [EMAIL PROTECTED] for requests. ___ Need new parts? Check out out Rusty at www.buymbparts.com for your best deal on new parts. ___ Mercedes mailing list [EMAIL PROTECTED] http://striplin.net/mailman/listinfo/mercedes_striplin.net
Re: [MBZ] glow plug problem
I realized I may have made a mistake here. My 617 plugs draw a bit over 20 amps when cold, quickly dropping to around 14A as they heat up. I have no idea how much current Kaleb's 603 plugs should draw.
Re: [MBZ] glow plug problem
at the very bottom is a box to enter your email address in to get password, change delivery etc, its the list box/button on the bottom. Marshall Booth wrote: All the Mercedes diesels that use parallel plugs and have a fuse use the same 80 A fuse whether there are 4, 5 or 6 plugs. All of the plugs have identical electrical requirements - a 12V supply (that will drop to 11V or a little less when the plugs are first energized because of the high current and the voltage drop across the battery itself and the connecting wires). Initial current for each plug should exceed 20 A for the first few milliseconds but will quickly drop to less than 15 A and by 20-30 sec should drop to 8-10A. Shorted plugs are possible (I've only heard of a few) but shorted wiring is MUCH more common (wires pinched to the clips, bracket or intake manifold or terminals rotated so they touch something they shouldn't). When plugs fail, they much more commonly open, not short. The resistance of every good Bosch or Beru parallel plug I've ever seen was 0.6 ohms when at ambient temperatures. There is a TINY chance that a plug could measure 0.6 ohms but short (and the resistance drop) as it heated up. Marshall -- Kaleb C. Striplin/Claremore, OK 89 560SEL, 87 300SDL, 87 300SDL, 85 380SE, 85 300D, 81 300TD, 81 240D, 81 240D, 76 240D, 76 300D, 74 240D, 69 250 Okie Benz Auto parts-email for used parts
Re: [MBZ] glow plug problem
It was bosch, and it was on #6 Mitch Haley wrote: Kaleb C. Striplin wrote: The wierd thing is the one that was broke looked brand new, like it was just installed not too long ago. Was it Bosch, Breu, or junk? If not junk, I wonder if that cylinder eats plugs. -- Kaleb C. Striplin/Claremore, OK 89 560SEL, 87 300SDL, 87 300SDL, 85 380SE, 85 300D, 81 300TD, 81 240D, 81 240D, 76 240D, 76 300D, 74 240D, 69 250 Okie Benz Auto parts-email for used parts
