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Unread 09-11-2013, 01:58 PM   #1
korneld
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Join Date: Sep 2013
Location: Atco, NJ
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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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Unread 09-11-2013, 02:17 PM   #2
sAe23
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1995 XJ Cherokee 
 
Join Date: Apr 2009
Location: Los Angeles / SFV, California
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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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Unread 09-11-2013, 02:49 PM   #3
wgirvine
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1992 XJ Cherokee 
 
Join Date: Oct 2007
Location: Rosamond, CA
Posts: 603
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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Unread 09-11-2013, 06:12 PM   #4
sAe23
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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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Unread 09-12-2013, 08:40 PM   #5
Muddy97Cherokee
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1997 XJ Cherokee 
 
Join Date: Aug 2011
Location: Mustang, Oklahoma
Posts: 635
Ya, it's definitely not as simple as just throwing the alternator on the belt.
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