charging system
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New User
Joined: Oct 2003
Posts: 13
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charging system
ok i have the worst luck with alternators. heres the deal. i got the bronco and the system was working good. i put in a stereo system with the correct power caps to protect the system. but slowly the the voltage reading went down. at idle it would be 12.5 at the most and sometimes 11.5. if i would rev the motor it would go up to 14.1 but never higher. i picked up a new alternator and had it bench tested and it was reading at 14.5 put it in the truck and the charging system never read over 14. now its doing the same thing and dropping to 12.5 at idle and never going over 13.9 when i bring the rpms up. would this be a nother bad alternator??? 
Elder User
Joined: Apr 2003
Posts: 779
Likes: 9
From: Tumwater, Wa
What year is is? 84/5 or an 86-up? I would suspect the regulator.
Take the caps out of your system and see if it improves. If the caps drain faster than they can charge, they are just a drain on your electrical system.
Take the caps out of your system and see if it improves. If the caps drain faster than they can charge, they are just a drain on your electrical system.
Senior User
Joined: Sep 2003
Posts: 144
Likes: 0
From: North West Florida
You may have an alternator with too low amperage. 60 amp is normal for our BII's but adding more load to the system will cause you to buy a more powerful alternator. Look at 125 amp alternators.
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