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#1
10-31-2003, 12:45 PM
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Found source of battery (idiot light) issue finally - unreal
I posted awhile back that within a week on both my 300SD and 300TD the battery light would come on at startup and with some RPM would go away. The other thing that caused it to go away was releasing the emegancy brake.
I can't beleive the cause, but after alot of hours spent on it, here it is. If one of the idiot light blubs is dead , it causes strange things to happen. In the case of the 300TD, it was the high beam bulb (which I didn't know about as it is my wifes wagon) and in the case of the 300SD it is the brake wear light. The stranger part is that if I swap the high beam with the brake wear on the SD everything is fine, which is the light that is causing the issue (I am assuming as I have yet to play with the TD) in the TD.
__________________
 1980 300TD-T (82 Turbo and Trans) 159,000 Miles "Jackie-O"1983 300SD 272,000 Miles "Aristotle" 1987 Jeep Wagoneer Limited - keeps the MB's off the ice and out of the snow 1994 BMW 530it 
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#2
10-31-2003, 01:16 PM
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Wow, I didn't realize those instrument clusters were made by Lucas.
__________________
Rick Miley 2014 Tesla Model S 2018 Tesla Model 3 2017 Nissan LEAF Former MB: 99 E300, 86 190E 2.3, 87 300E, 80 240D, 82 204D Euro Chain Elongation References
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#3
11-02-2003, 09:50 AM
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BIGRED
Thanks for the tip. My '82 SD was doing the same thing. I would give it some fuel after starting and the alternator light would go out. I had recently replaced the alternator and thought it was something inherent in the new alternator. My wife was using the car yesterday and I noticed one brake light was out. I changed the brake light bulb and the alternator light no longer glows after start up. Tom '82 SD '86 SDL
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#4
11-02-2003, 10:55 AM
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Often, on certain other unmentionable brands of cars,
such odd behavior of warning lights and taillights, etc. turns out to have roots in bad grounds to the chassis from the light units or dashboard.
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#5
11-02-2003, 11:53 AM
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Re: Often, on certain other unmentionable brands of cars,
Quote:
Look at where the battery neg cable is attached to the vehicle. Most older 123's have that whole area of the thin sheetmetal it attaches to rusted. I'm thinking I'll run a ground strap directly to the engine and MORE than one to the instrument panel (already have an extra one to the back of the speedo housing - cured a weird electrical issue with the panel).
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1984 300D Turbo - 4-speed manual conversion, mid-level resto 1983 300D - parts car 1979 300TD Auto - Parts car. 1985 300D Auto - Wrecked/Parts. ========================= "If you don't know where you are going, any road will get you there". Lewis Carrol
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#6
11-02-2003, 12:27 PM
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Interesting thread but I am not sure....are you guys saying that a bad ground and a bulb out are two seperate things? How would BIGRED changing a bulb fix a ground problem?
I have heard using non OEM bulbs in the tail lights can toast your cruise control amp and cause other weard problems. Anyone know about that?
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 1985 Euro 240D 5 spd 140K 1979 240D 5 spd, 40K on engine rebuild 1994 Dodge/Cummins, 5 spd, 121K 1964 Allice Chalmers D15 tractor 2014 Kubota L3800 tractor 1964 VW bug "Lifes too short to drive a boring car"
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#7
11-02-2003, 02:39 PM
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Quote:
__________________
"Know other lessons I need to learn? TELL me. Tired of learning'em the hard way". Glow Plug Wait: [i} Time of silence in homage Rudolph Diesel. Longer you own a diesel. more honor you give". [/i] Life; SNAFU Situation Normal All Fouled Up, & FUBAR: Fouled Up Beyond All Repair -Now: Snafued Jeep TJ w/OM617 2Be daily driver & building SS M1079 w/Ambo boxed /live in Adv. Truck, Diesel KLR conversion -Sold 62 UNIMOG Camper w/617 Turbo, 85 300SD
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#8
11-02-2003, 02:49 PM
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Sometimes a bulb in a complex lighting unit
can send its current to ground through another bulb (at the loss of some brightness), but when the other bulb burns out, they both quit lighting and sometimes a bulb can ground through a filament which is not in use, but can't when that other filament turns on -- ask any old codger like me who's fought with ground problems in '65 Chevy taillights in his youth -- remember the ones on which, when you turn on the turn signals one way, the _taillights_ on the opposite side of the trunk lid would start blinking on and off?
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