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Disconnected battery with engine running? 200 1989

posted by  Trev29 on  Sat Mar 2 06:49 CST 2019
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last visit: Fri Oct 17 05:56 CST 2014
[RELATED]

"Change the voltage regulator and started the car on the first attempt. He then disconnected the battery cables and the car died."
With modern computerized cars, I'm pretty sure you shouldn't disconnect a battery with the engine running and the alternator operating because of possible voltage and current spikes which could fry the electronics.

I don't have a computerized 240, but I think my sister's '89 takes a 25 amp fuse.

The fuel pumps engage first to pressurize the system so would be the suspect high current draw before the starter is engaged to turn over the engine. But you've already tried disconnecting the fuel pumps. Hence something in that circuit may be shorted?
--
1980 245 Canadian B21A with SU carb, M46 trans, 3:31 dif, in Brampton, Ont.






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