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#1
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Mysterious electrical problem w124
Hey y'all,
Asking for your input on diagnosing and an electrical problem. '92 300d w124 Most of the time everything is fine no symptoms of the problem at all Sometimes for no apparent reason the problem will show itself. Tach,temp,fuel and oil pressure gauges will all start "cutting out" Also can hear the seatbelt buzzer sounding faintly Any ideas to get me pointed in the direction of getting this figured out will be appreciated. Thanks
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Current fleet 2006 E320 CDI 1992 300D - 5speed manual swapped former members 1984 300D "Blues Mobile" 1978 300CD "El Toro" |
#2
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OVP going bad?
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'85 300TD "Puff The Magic Wagon" - Rolling Resto '19 Mazda CX-9 Signature - Wife's sled '21 Morgan 3-Wheeler P101 Edition '95 E300d - SOLD '84 300TD "Brown Betty" - Miss this one '81 240D "China Baby" - Farm grocery getter |
#3
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I've never looked into diagnosing OVP relay problems. Will look Into that.
The problem also seems to be correlated to stapling on the brakes. As in, it will go from showing some readings to showing nothing when I depress the brake pedal.
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Current fleet 2006 E320 CDI 1992 300D - 5speed manual swapped former members 1984 300D "Blues Mobile" 1978 300CD "El Toro" |
#4
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This is screaming "Ground problem"
Do you have the schematics for the car?
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The OM 642/722.9 powered family Still going strong 2014 ML350 Bluetec (wife's DD) 2013 E350 Bluetec (my DD) both my kids cars went to junkyard in 2023 2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles) 2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles) 1998 E300DT sold to TimFreeh 1987 300TD sold to vstech |
#5
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Mine started doing that when the alternator was going south...
have the alt checked. and test the battery, and all the connections while you are at it!
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#6
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Yeah, ground problem. I thought about that. Still haven't had a chance to go underneath to check out the grounding "strap". I assume that it's a similar setup as a w123.
I don't have any electrical schematics for this model. Is there a good source for those out there somewhere? Alternator... Nothing is impossible at this point I guess but I'm pretty sure the alternator was replaced just before I got this car last year. Looks new. Not sure. Could have it checked fairly easily I suppose.
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Current fleet 2006 E320 CDI 1992 300D - 5speed manual swapped former members 1984 300D "Blues Mobile" 1978 300CD "El Toro" |
#7
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Schematics at Model 124 Maintenance Manual Index
Along with the rest of the 124 FSM Startek was not working last time I checked a week ago.
__________________
The OM 642/722.9 powered family Still going strong 2014 ML350 Bluetec (wife's DD) 2013 E350 Bluetec (my DD) both my kids cars went to junkyard in 2023 2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles) 2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles) 1998 E300DT sold to TimFreeh 1987 300TD sold to vstech |
#8
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X2 for ground fault.
It wouldn't hurt to run a starting charging and battery system test at an Autozone. Make sure your variables there are within tolerances.
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'84 190D 2.2 5MT (Red/Palomino) Current car. Love it! '85 190D 2.2 Auto *Cali* (Blue/Blue) *sold* http://badges.fuelly.com/images/sig-us/302601.png http://i959.photobucket.com/albums/a...0/sideview.png |
#9
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ground problem! don't miss a strap, there will be a number of them. also, an intermittent circuit due to cracked solder within the cluster is another possible cause. on the W123 it has been recommended to add another ground strap there for security. good luck.
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'77 240D, 504H, OM617.952, etc. |
#10
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I put an alligator clip to a wire. One end to a screw behind cluster , the clip to a frame part. Boozanger. Fixed
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#11
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Seem to have gotten it sorted out. Took the main ground cable off and cleaned a bunch of white powdery stuff off of both sides. Have not had the problem since.
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Current fleet 2006 E320 CDI 1992 300D - 5speed manual swapped former members 1984 300D "Blues Mobile" 1978 300CD "El Toro" |
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