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#1
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1985 300d turbo won't start without jump
My 85 mercedes 300d turbo is having trouble starting. I put in the keys, dash lights come on, but as soon as I try to start there's a loud click sound and the dash lights go out again. If I immediately take the keys out and try again nothing happens, no dash lights or anything, but if I let it sit for a while then dash lights will come on again. Oddly, it starts fine with a jump, runs normally, but as soon as I turn it off it won't start again. Tested the battery at autozone and it seems to be fine. Any ideas?
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#2
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Did you have the alternator tested also?
I had to replace both battery and alternator when that happened to me. I bought a 75 amp alternator for a gasser w126. I have had no more issues like that.
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RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K 90 Dodge D250 5.9 Cummins/5 speed. 400K |
#3
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To explain the phenomenon - batteries will, to an extent, recharge themselves if left alone. They will NOT generate a full charge. So you're getting enough power to light the lamps but it takes a lot of amps to spin over any engine and especially a Diesel.
Sounds like the battery is OK or it probably wouldn't regenerate itself. I'd check the alternator for sure. Pull it off and take it to your local alternator shop. They'll spin it up on a test rig and evaluate. They can either rebuild yours or they may have a rebuilt sitting on the shelf. My local shop ALWAYS does a great job for me and charged me $100, which is a pretty good deal. They stand behind their work 100%. Also take a REALLY good look at your cables and the state of your grounds. Remember that EVERYTHING (the chassis, body, and engine) have to get a complete ground loop back to the battery. Many electrical Gremlins can ultimately be traced back to grounding issues. Dan |
#4
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Quote:
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1983 300D, the "Avocado" 1976 240D, 4-spd the "Pumpkin", SOLD to Pierre 1984 190D, 2.2L, 5-spd, my intro to MBZ diesels, crashed into in 2002 |
#5
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Also, those symptoms can also be caused by poor connection at the battery terminals. Have you pulled off the cables, cleaned them up?
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1983 300D, the "Avocado" 1976 240D, 4-spd the "Pumpkin", SOLD to Pierre 1984 190D, 2.2L, 5-spd, my intro to MBZ diesels, crashed into in 2002 |
#6
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If the battery light on the dash coming on when the key is turned? If it does, does it go out or stay lite?
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#7
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CLASSIC symptoms of loose ground braid bolt... it will also do this if the large bolt on the starter solenoid is loose... or of course if the battery cables are bad or loose.
1. check the battery cables, at BOTH ends. 2. follow the large wire from the battery positive, to the starter and make sure it's tight on the solenoid. 3. elevate the car and climb under there and find the braided cable that connects the transmission bellhousing to the body of the car, and make sure the bolts are tight on both ends... 4. the fact that jumper cables connected to the battery get the car started lead me to focus on the battery terminals themselves. I'd pull the cables off the battery, and clean the battery terminals, and the inside of the battery cables...
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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! |
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