How much amps should a alternator read???

[Scootro]

Well I think my 94’ lightning’s alternator might be on its last leg.

I tested my alternator tonight and it read about 30 amps shouldn’t it be reading a constant 45 or high amps????

Anyone got any suggestion on where I can get a direct replacement alternator with the stock 95 amperage????? I’ll regret replacing this with a oreilly or autozone alternator!

 

[praugue]

How are you testing this? The amount of amps is only what is needed.

 

[HISSIN50]

I wondered about the testing method as well. A loaded test is required. Or maybe you're using an inductive meter to see idle output.

As far as the 3G, PA-P and Alterstart are two common choices for getting higher output 3G alts. You do have to do a little modification on a mustang to make them work (I don't know much about Lightnings).

Good luck.

 

[Mustang5L5]

You don't really go by amps as the alt will only output the amps needed.

Go by the voltage instead. If it's putting out 12V at idle and 14.4V+ above idle then it's putting out the proper juice.

Could be a junk battery causing a drain or short or just not holding the charge