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#1
05-22-2007, 07:01 PM
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Engine won't crank
My alternator was charging at 13.9 volts last I checked a week ago and I have not had starting problems. I did a few 0-60 timed runs today after which I noticed the temp gauge needle fluctuating. So I tried to find the temp sender and wasn't sure if I found the correct one. I then tried to start the engine and it won't crank. Measured battery voltage and it was at 12.40 volts. It is on the charger now. What do you think happened? Did the alternator crap out during the timed runs? Sounds unlikely. Battery crapped out? Both crapped out?
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85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked Last edited by funola; 05-22-2007 at 11:14 PM. 
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#2
05-22-2007, 11:53 PM
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After a few hours of charging, I tried cranking the engine again. No go.
But something weird is happening: The high beam, battery light and seat belt indicator came on when I turned the key on even though the headlight switch was off. Yet when the key was turned off, the indicator lights stayed latched on!  I had to disconnect the battery to turn them off. I do not have my Hayes manual with me so no wiring diagram to refer to. Can someone point me to a wiring diagram online (if available) of the start and accessory relay circuit? I am suspecting a bad battery because while charging, I measured 15.5 volts across it. It shouldn't go that high I don't think. Tomorrow, if it still won't crank, I'm gonna see if there is power to the glow plugs and if so, jump the starter solenoid and see if it starts. If not I'm buying a new battery.
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85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked
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#3
05-23-2007, 12:35 AM
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I had a battery go bad and not allow charging, so its possible. Its got to be either a bad battery, voltage regulator....or ignition switch. Probably the battery if you are reading random voltages like that.
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-diesel is not just a fuel, its a way of life-  '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k)
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#4
05-23-2007, 06:12 AM
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i suggest checking and cleaning all your grounds, including the engine to chassis strap. an auxiliary ground from a starter bolt to the battery is sometimes needed on an older car as well.
tom w
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.  [SIGPIC]..I also have a 427 Cobra replica with an aluminum chassis.
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#5
05-23-2007, 02:37 PM
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Tom, you were right on! It was a loose bolt on the engine ground strap!
Quote:
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85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked
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#6
05-23-2007, 06:56 PM
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good deal for you!
it is one of three things i know about electrical! it is so simple that it is often overlooked and much more complicated soulutions pursued. tom w
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual. [SIGPIC]..I also have a 427 Cobra replica with an aluminum chassis.
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