Using Old XJ Alternator as a Motor -

LinkBack Thread Tools
post #1 of 5 Old 09-11-2013, 01:58 PM Thread Starter
Registered User
Join Date: Sep 2013
Location: Atco
Posts: 1
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.

korneld is offline  
Sponsored Links
post #2 of 5 Old 09-11-2013, 02:17 PM
Registered User
1995 XJ Cherokee 
Join Date: Apr 2009
Location: Los Angeles / SFV
Posts: 3,305
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!
sAe23 is offline  
post #3 of 5 Old 09-11-2013, 02:49 PM
Registered User
1992 XJ Cherokee 
Join Date: Oct 2007
Location: Rosamond, CA
Posts: 652
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.

The road goes on forever, the party never ends....
wgirvine is offline  
post #4 of 5 Old 09-11-2013, 06:12 PM
Registered User
1995 XJ Cherokee 
Join Date: Apr 2009
Location: Los Angeles / SFV
Posts: 3,305
Yeah, I was having my doubts, but hey, it's on the Internet so it must be true
sAe23 is offline  
post #5 of 5 Old 09-12-2013, 08:40 PM
Registered User
1997 XJ Cherokee 
Join Date: Aug 2011
Location: Norman
Posts: 703
Ya, it's definitely not as simple as just throwing the alternator on the belt.

1997 XJ Sport
6.5" with 31's
Built to CRAWL
IG: zack_hstadt
Muddy97Cherokee is offline  

Quick Reply

Register Now

In order to be able to post messages on the forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome