Charging System Trouble

OK I have an 87 4cyl. I recently replaced a dead battery and then discovered that the alternator was only charging at 12V so I had it checked at autozone and it was only generating 5A. So I replaced the alternator. With the new alt. the charging voltage is still only 12V not the norm 13-15V. Sooo...new alt. and batt. and I checked all of the connections and wires and all looks legit. By the way all of the accessories work fine.

What am I missing here? Is there more to the charging system???
Why only 12V when I definately had 14V before, when all was good?

thanks for all the help guys

Wow, you waited a whole 16 minutes before getting pissed off no one replied?

I'd check, and re-check grounds. Jeeps are notious for bad grounds. Can cause all sorts of problems. Replace if in doubt.

Flyfisher said:

I'd check, and re-check grounds. Jeeps are notious for bad grounds. Can cause all sorts of problems. Replace if in doubt.

Click to expand...

Especially RENIX-era (1987-1990, gas engine) XJ and MJ.

Pay particular attention to the ground strap from the cylinder head to the firewall - a shonky connection there can cause all sorts of headaches for you.

And, give your question some time before it gets answered. It helps...

Hallo. It is better to take the measurements on the altenator itself. Did you?
:idea: