Alternator AND battery dead at the same time?

Reply Subscribe

Thread Tools

Search this Thread

#16

11-03-2007 | 10:21 PM

TNC

Senior Member

Joined: Sep 2001

Posts: 620

Likes: 0

From: SoCal

Quote:

Originally Posted by Tbird69

Technically, the alternator puts out more then 14 volts. The regulator maintains 14 volts to prevent overcharging. If the battery is completely fried, you will get less the 14 volts because the alternator is carrying the full electrical load, especially if there are alot of aftermarket accessories such as a big stereo. This will result in the alternator cooking because of the higher then normal load.

Actually, you'll get 14V. The alternator will be outputting max. which is regulated usually to 14V +-1V. A dying battery can easily kill an alternator which as you said will be carrying most of the load. The alternator will run hotter and hotter and sooner or later the diodes will fail. But the question was dead alt. and dead battery. Yes, it's fairly common. I see a lot of guys replace the alternator with a weak battery only to kill the new alt.

Reply Like

Reply Subscribe

Reply Share

First
Prev
2 / 2
Next
Last