Using Old XJ Alternator as a Motor -
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post #1 of 5 Old 09-11-2013, 01:58 PM Thread Starter
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Using Old XJ Alternator as a Motor

I just pulled my alternator, the bearing started to go. Got a new one, installed it, but now I'm thinking to keep the old one and play with it.

You see people applying voltage to their alternators on YouTube and they run just fine. I can't get it to work though. I hook up my hot lead to the terminal and I attach the ground to the housing and nothing happens. What am I missing here? I've tried 12 and 24 volts from car batteries. Btw, it should work without the coil inside energized. This is according to the videos anyway.

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post #2 of 5 Old 09-11-2013, 02:17 PM
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1995 XJ Cherokee 
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Apparently there is more to it that just hooking up power... One site I Googled (I am NOT an engineer and have NEVER tried this) implied there are internal mods that need to be done, along with external controllers. They also used 36 volts to get it to work.
FWIW, I Googled "alternator as a motor".

Good luck!
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post #3 of 5 Old 09-11-2013, 02:49 PM
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1992 XJ Cherokee 
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Nope, won't work. You can supply 12 volts to a GENERATOR, and it will turn (but very weak.) But not an alternator. They just don't work that way.

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post #4 of 5 Old 09-11-2013, 06:12 PM
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Yeah, I was having my doubts, but hey, it's on the Internet so it must be true
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post #5 of 5 Old 09-12-2013, 08:40 PM
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1997 XJ Cherokee 
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Ya, it's definitely not as simple as just throwing the alternator on the belt.

1997 XJ Sport
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