weird problem - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 7 (permalink) Old 01-22-2009, 04:35 PM Thread Starter
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weird problem

Im posting this for a friend.
He has a 92 250 and for some reason the truck isnt charging like it should. THe alternator tests 14.2v, but the amp gauge shows discharge. he can start the truck and it will start but coming to work lights go in and out and sometimes it wont start back when goes to leave work??? any ideas
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post #2 of 7 (permalink) Old 01-23-2009, 04:35 AM
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There is a connection in the alt output wire. It is located about 1' foot away towards the passenger side fender well. Check it and see if it came loose or the terminals have corrided up and lost connection.

93 W350 w/duals, fuel pin turned, 6X.018" injectors, 4" exhaust, 3" air intake horn, HX40/16, G56 /SBC Con-OFE, 307's axles' 2" skyjacker lift, B&W flatbed
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post #3 of 7 (permalink) Old 01-23-2009, 02:02 PM
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Do a voltage drop test on the alternator electrical going to the battery and the weak connection will show itself.

http://mopar.mopar1973man.com/tips/c...ed-circuit.htm

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post #4 of 7 (permalink) Old 01-24-2009, 05:38 AM
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same problem with my truck, it was my crank shaft sensor on the front of the engine. but that dosen't mean it's the same problem. just give him a heads up
that could be a source of the problem.

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post #5 of 7 (permalink) Old 01-29-2009, 03:18 AM
 
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had a problem with my 91 the other night all at once the amp gauge goes to discharge with all the lights and crap on .. then a half hour later it decides it wants to start charging again .. next day same thing ,, checked the alt and its ok ,and after some checkin i pulled the voltage regulator plug off and the terminals were corroded inside so it wasnt making good contact. pretty simple fix . if thats what the problem is .. doesnt hurt to check it anyway, the reg is on the firewall next to the wiper motor clean the terminals and use some dialectric grease when you put the plug in back together hope this was of some help.
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post #6 of 7 (permalink) Old 01-29-2009, 06:55 PM
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Is his Tachometer working? if not it is the crankshaft sensor. Make sure the air gap is correct, and that the plug at the front of the engine, right by the #1 cylinder valve cover has a good connection. This is what tells the computer that the truck is running, and therefore tells the alternator to charge. or so I understand. I had the same problem, connector at the font of the engine was not making a good connection.

1992 W250-P-pump and some extra air, gone, but not forgotten.

2003 SVT Cobra

1984 Chevy K10

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post #7 of 7 (permalink) Old 01-29-2009, 07:19 PM
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Is his Tachometer working? if not it is the crankshaft sensor. Make sure the air gap is correct, and that the plug at the front of the engine, right by the #1 cylinder valve cover has a good connection. This is what tells the computer that the truck is running, and therefore tells the alternator to charge. or so I understand. I had the same problem, connector at the font of the engine was not making a good connection.

1992 W250-P-pump and some extra air, gone, but not forgotten.

2003 SVT Cobra

1984 Chevy K10

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