Battery is not charging

[Joey84cj7]

I have a new battery, alternator, and fuse wire between synoloid and alternator. I'm still only reading 12.5 volts on battery when the engine is running. This eventually leads to a dead battery. The engine will start with a jump but dosent charge the battery. Also, not sure if it is related or not but it won't idle very long. Maybe 2-3 minutes and then dies. It idles round around 5-6 thousand rpms. Any ideas?

 

[InfidelOffroad]

Did this problem exist before the new parts, or is it a new build?

 

[Torxhead]

If you have the alternator turning, and the other red wire is hooked up then it must be putting out some juice, providing it is a good alternator.

 

[InfidelOffroad]

If you have the alternator turning, and the other red wire is hooked up then it must be putting out some juice, providing it is a good alternator.

Not true. The alternator needs to get 12v excitation to the (1) connector. Without this it wont get the "charge" signal.

 

[Torxhead]

Not true. The alternator needs to get 12v excitation to the (1) connector. Without this it wont get the "charge" signal.

Sorry, I guess I wrote that wrong, I was referring to that "Sense" wire, which is red.

 

[InfidelOffroad]

With that being said, I would like to know how exactly he has it wired.

 

[Joey84cj7]

Started sticking the multimeter in different places to check for voltage and I guess I had a connection that wasn't connected good. After I started messing around with it I started getting a charge to the battery. I thought I doubled checked them earlier but I guess not good enough. Thanks for your help.

 

[Torxhead]

Getting secure electrical connections can be a bit tricky, Good to hear you got the problem fixed.

 

[CRETE4U]

It idles round around 5-6 thousand rpms. Any ideas?

I'm sure you meant 5-6 hundred?

 

[Joey84cj7]

Yes I did mean 5-6 hundred. A friend of mine looked at it last night and tried to adjust the idle but wasn't very successful so he things the carb needs a tune up.

 

[Lumpy Grits]

You should see 14-14.5vdc at idle.
You should take that Alt in and have it ck'd for AMPS-Amps are what charge your battery.
The biggest issue with a CJ's electric systems arfe bad grounds. Clean them and keep them clean for good electric flow.
LG