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Dead 240 1992 sedan 200

posted by  ricko on  Sat Oct 20 14:24 CST 2012
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last visit: Thu Aug 21 08:31 CST 2014
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Yesterday daughter called and stated that the car died and dash lights came on and won't restart with a jump, she tried twice and could not keep the car running.

Since she was 20 miles away, I had our friendly mechanic come up with tow truck. We arrived and jump started the car, alternator putting out 11 volts. Towed car home.

Today installed good alternator, tested at NAPA, is putting out 14 volts. I installed alternator with new ground wire and tried to jump start. Nothing. The jumper cables started to smoke, I pulled them off and rechecked connections , all proper, + to + and - to -. I checked the wiring on the alternator and the new ground wire was charred and melted. Stumped.

Stopped everything and wrote the Brickboard for advice please.








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    Dead 240 1992 sedan 200

    posted by  Volvodad on  Sat Oct 20 15:20 CST 2012
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    last visit: Thu Oct 23 16:18 CST 2014
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    Could be a dead short in a large, unfused cable; maybe the main alternator output cable that goes under the front crank pulley and joins the battery positive cable at the starter lug. This would make the jumper cables smoke and since the new alternator is trying to feed 12V into a dead short, its ground cable wouldn't handle the load. You can check by first disconnecting the battery's negative terminal, then the Red alternator cable from the B+ terminal. Check the Red cable's resistance to ground (engine block). Should be...

    *edit* ..after some thought. it probably requires the Red alternator cable to be disconnected at both ends to properly check if it is shorted to ground.
    --
    Bob: son's XC70, dtr's '94-940, my 81GL, 83-DL, 89-745(V8) and 98-S90. Also 77-MGB and some old motorcycles.







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