Close
Car Questions
RepairPal is your advocate for car care advice and guidance

Why alternator not showing any voltage or charging battery?

(1990 Dodge W150)
in Harrisburg, PA on April 25, 2010
1987 Dodge ram 150 or 1500 pick up truck. I've put 2 new alternators in & neither one is showing voltage or what ever & isn't charging battery & my mechanics & I can't figure out why. please help?
Displaying 2 answers & 1 comment
Popular Answer
on January 23, 2011
had same problem with my 91' 'computor' the alternators are internally regulated- but to save fuel, dodge had a feature that would only turn on the regulating of the alt. when the voltage was at min. there is one little ground wire from the computer that controls this- want a much cheaper fix? take back your alt . and buy a internally regulated alt for a 'chevy' simple to wire - and this does not set off any new codes -or confuse the computer. i had the auto-parts stores scratching their heads too- brand new alt -wouldnt charge-on the truck- but kept passing on their bench test! I admitt this sounds like a weird fix- but when you price a new pcm-its the way to-go. thats " of coarse" if you have encountered the same as i did.
Sign in to reply
on February 19, 2011
i also have a 91 dodge ram and am having the same issues. what size alt should i get gm product wise with 318motor?
on June 23, 2010
i have a simalar problem except mine shows minus 12 volts no matter what i change it has not helped
Sign in to reply
Get a repair estimate
RepairPal estimates are guaranteed at over 2,000 quality certified locations nationwide.
Or interested in getting a repair? Find a Shop

Similar Questions

View answers to similar questions from RepairPal's community of auto experts and enthusiasts.
It's stuck on ne all the time. sometimes "compass error" appeared and no other data shows up.
I have a 2005 kia sorento and the check engine light is on. i had it checked and it was reading that the o2 oxygen s...
Didn't find what you were looking for?