89 power problems

[DrakeStevens95]

My bronc was dying after it started so I checked and found out the alternator is bad. I replaced the alternator and it kept happening. I replaced the battery and cables because of the famous ford corrosion. But it still dies. I can drive it for a bit but if I'm at a light it will die and then it won't start at all. Like the battery died. I need help!

 

[Rons beast]

Hey Drake,

Welcome

Did you replace the ground cable too?  Without good  grounds all sorts of electrical problems can occur.

Also have the alternator tested. It may not be charging the battery enough or it could be the leads to the alternator to "excite" it.

Some of these circuits run through the "BAT" idiot light. If the bulb is burned out the alternator won't provide a charge.

Can you verify what voltage you have coming out of the alternator at idle?  At 2000 rpm with accessories on?

Good luck