Re: [MBZ] 126 Electrical Gremlins
Michael, I sent the 350SDL glow system stuff from the maint. CD to you a few minutes ago. Wilton - Original Message - From: "Angelo Giaimo" To: Sent: Monday, December 28, 2009 7:41 PM Subject: [MBZ] 126 Electrical Gremlins Well, although the paint job is done, the car's now got a few electrical problems. I already mentioned the tach not working, but today, I had a dead battery...purchased in '03, I figured it was time to put a new one in. ~$125 from the dealer. (I get a discount for a 'vintage' car.) Car now cranks, but won't start. GP light not coming on. Plugged it the block heater for about an hour (31 degrees outside) and after several attempts, I got it running., Now, when I try to start the car, (as before) no GP light, but after it starts, the GP light comes on for about a minute and then goes off. Now I could see loosing one or two GP's and still being able to start the car, but I suspect with as difficult it was to start and as rough as it ran, maybe I lost all of them? Or should I be looking at the GP relay? Is the GP ckt fused? Can't find it in the ETM or the fuse list in the box. As an aside, even after it was warmed up, about 5 minutes, it still runs rough at idle, but smothes right out when I hit the throttle. Any clues as to what may be wrong? Thanks, Angelo 1990 350SDL Rodbender 276K miles. ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] 126 Electrical Gremlins
His car does not have that. OK Don wrote: It's a flat plate/strip fuse held in place with screws at each end - not a standard autop fuse in a holder. It can look OK, and still be cracked. -- Kaleb C. Striplin/Claremore, OK 95 E300, 92 500SEL, 92 300SD, 92 300E 4Matic, 91 350SDL, 91 300D, 89 560SEL, 87 300SDL x2, 85 380SE 5.0 Euro, 85 190D, 84 190D, 84 300D euro manny, 76 240D, 76 300D, http://www.okiebenz.com ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] 126 Electrical Gremlins
Alex Chamberlain wrote: Not nearly as often as it is telling you that the GP relay itself is bad. In my case, it was telling me that the tiny five year old 700CCA battery was no longer up to the job. When that finally died, and I put in a brand new Group 49, the glow lamp in my W116 started working properly again. Mitch. ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] 126 Electrical Gremlins
On Mon, Dec 28, 2009 at 6:06 PM, Peter Frederick wrote: > The GP relay is self diagnostic -- if you don't have balanced current for > all the plugs, the light will either not come on at all or flash, then come > on again after you start the car. This is to tell you to fix the glow > plugs! > Not nearly as often as it is telling you that the GP relay itself is bad. This has been discussed before. It should be in the archives. IIRC Marshall opined that the GP relays in 60x-engined cars had a finite life, such that any originally installed was surely faulty by now, and a NOS Mercedes part might have been sitting on the shelf long enough to be faulty as well (due to dried-out electrolytic caps or some such). This was after several people described glow problems that *weren't* cured by replacing the relay after all plugs tested fine. Alex ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] 126 Electrical Gremlins
On Mon, 28 Dec 2009 20:06:57 -0600, Peter Frederick wrote: You have at least two glow plugs bad, maybe more. It's possible the fuse has cracked (they do, with age), but I'd guess you have more than one bad GP, too. The GP relay is self diagnostic -- if you don't have balanced current for all the plugs, the light will either not come on at all or flash, then come on again after you start the car. This is to tell you to fix the glow plugs! Pete, Since the GP light is coming on/off, does this mean the GP fuse is OK? I only see two plugs on the topside, One for the GP's, the other for power. The ETM shows the fuse internal to the relay. (Yes, I did find it in the book!) Does is dis-assemble to access the fuse? I'll bug out the GP's tomorrow in the daylight. Thanks, Angelo ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] 126 Electrical Gremlins
To check the plugs, pull the cap off the GP relay. Pull the harness to the GPs off the relay. Test each pin in the plug to ground. As Peter said, they should be about 0.8 ohm to ground. You can find op GPs easily with any cheap multimeter. to measure 0.7 to 0.8 takes a good meter. Most fail open. Some fail grounded, and that takes out the fuse. If one plug shows 1 ohm higher resistance, it is on the way out. If you have a 4 cyl or a 5 cyl, one or two pins are blank. You have at least two glow plugs bad, maybe more. It's possible the fuse has cracked (they do, with age), but I'd guess you have more than one bad GP, too. Fix the fuse, but check all six GP for resistance to ground, should be 0.8 ohm. If one or more are bad (open or very high -- or lower than 0.08), get all six and replace them all. Don't use Champions, get OE Bosch -- the champions are meant for 6v via duty cycle, not 12V even though they are rated 12V, and will fail very quickly. I've put them in my Volvo, not a good plan. The GP relay is self diagnostic -- if you don't have balanced current for all the plugs, the light will either not come on at all or flash, then come on again after you start the car. This is to tell you to fix the glow plugs! Peter ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] 126 Electrical Gremlins
You have at least two glow plugs bad, maybe more. It's possible the fuse has cracked (they do, with age), but I'd guess you have more than one bad GP, too. Fix the fuse, but check all six GP for resistance to ground, should be 0.8 ohm. If one or more are bad (open or very high -- or lower than 0.08), get all six and replace them all. Don't use Champions, get OE Bosch -- the champions are meant for 6v via duty cycle, not 12V even though they are rated 12V, and will fail very quickly. I've put them in my Volvo, not a good plan. The GP relay is self diagnostic -- if you don't have balanced current for all the plugs, the light will either not come on at all or flash, then come on again after you start the car. This is to tell you to fix the glow plugs! Peter ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] 126 Electrical Gremlins
It's a flat plate/strip fuse held in place with screws at each end - not a standard autop fuse in a holder. It can look OK, and still be cracked. On Mon, Dec 28, 2009 at 6:51 PM, Craig McCluskey wrote: > On Mon, 28 Dec 2009 19:41:28 -0500 Angelo Giaimo > wrote: > > > Well, although the paint job is done, the car's now got a few electrical > > problems. > > > > I already mentioned the tach not working, but today, I had a dead > > battery...purchased in '03, I figured it was time to put a new one in. > > ~$125 from the dealer. (I get a discount for a 'vintage' car.) Car now > > cranks, but won't start. GP light not coming on. Plugged it the block > > heater for about an hour (31 degrees outside) and after several > > attempts, I got it running., > > > > Now, when I try to start the car, (as before) no GP light, but after it > > starts, the GP light comes on for about a minute and then goes off. Now > > I could see loosing one or two GP's and still being able to start the > > car, but I suspect with as difficult it was to start and as rough as it > > ran, maybe I lost all of them? > > Time to test them individually. I take them all out and, using vise-grips > to hold them because of the heat, jumper them across the battery and look > for the bright orange color. > > > > Or should I be looking at the GP relay? Is the GP ckt fused? Can't find > > it in the ETM or the fuse list in the box. > > The glow plug circuit is fused; the fuse is in the glow plug relay. > > > Craig > > ___ > http://www.okiebenz.com > For new and used parts go to www.okiebenz.com > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > -- OK Don CONSERVATIVE, n. A statesman who is enamored of existing evils, as distinguished from the Liberal, who wishes to replace them with others. The Devil's Dictionary Ambrose Bierce ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] 126 Electrical Gremlins
On Mon, 28 Dec 2009 19:41:28 -0500 Angelo Giaimo wrote: > Well, although the paint job is done, the car's now got a few electrical > problems. > > I already mentioned the tach not working, but today, I had a dead > battery...purchased in '03, I figured it was time to put a new one in. > ~$125 from the dealer. (I get a discount for a 'vintage' car.) Car now > cranks, but won't start. GP light not coming on. Plugged it the block > heater for about an hour (31 degrees outside) and after several > attempts, I got it running., > > Now, when I try to start the car, (as before) no GP light, but after it > starts, the GP light comes on for about a minute and then goes off. Now > I could see loosing one or two GP's and still being able to start the > car, but I suspect with as difficult it was to start and as rough as it > ran, maybe I lost all of them? Time to test them individually. I take them all out and, using vise-grips to hold them because of the heat, jumper them across the battery and look for the bright orange color. > Or should I be looking at the GP relay? Is the GP ckt fused? Can't find > it in the ETM or the fuse list in the box. The glow plug circuit is fused; the fuse is in the glow plug relay. Craig ___ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
