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Old 12-20-2011, 01:28 PM
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dual battery systems on YJ

When I installed the winch on my YJ I set it up for a dual battery system. The Jeep doesn't have A/C and is the 4cyl.

I found an old style Motorcraft alternator with the external regulator. Fabbed a mount to locate it in the A/C spot. Fabbed a shield to go around the fins on the alternator. Got the proper pulley for it.

The reason for the external regulator is that I can disconnect the alternator from the battery, put on full 12V to the field and get 120VDC out of it to run any brush type 120VAC tool.

I found that 2 of the small batteries will fit (SNUGLY) in the battery case. Don't remember exact type but have posts on top. The 2nd battery was then run to the winch.

Also, I put a solenoid between the two batteries with a momentary switch under the dash. That way, IF I left the lights on, battery was dead, or in Minnesota winter, I could push the momentary switch and bring in the 2nd battery for starting.

When I abandoned it in Minnesota 4 years ago I switched back to 1 battery and left the 2nd alternator installed. Now that I am restoring the Jeep, I will set it all up again.

You can get an electronic regulator for the Motorcraft alternator as they are extremely common.
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Old 12-20-2011, 08:03 PM   #2
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Old 12-21-2011, 08:24 AM   #3
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Old 12-27-2011, 08:30 PM
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Finally got around to taking some pics. It isn't a pretty installation due to tools I had. Basically it is just 2 pieces of angle iron cut to miss the alternator. Pretty simple.

I highly recommend the guard around the fins. Pretty easy to get into it otherwise. Probably could be a little more restrictive.




The belt is a little shorter than the A/C one would be. Have to just check length. I will try and get the number off the belt tomorrow.
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