Question about Cars & Trucks
Voltage alternator running low
Posted by Anonymous on
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Posted on Jan 02, 2017
SOURCE: Low voltage
what is the condition of the battery cables you are probably onto something about a ground but i dont think your ground issue is going to be at the batteries you may not have a good ground on the alternator. The next thing I would check is ... the alternator itself do you know that you are getting between 13.6 and 14.2 volts out of the alternator, a under charge or a overcharge condition both are bad for batteries.
I would check alternator output first if it is not within the above range you need to replace it
If the alternator is putting out in the range of 13.6 to 14.2 then you need to look elsewhere... you may have something draing the batteries overtime interior lights, electric brake controller for trailor brakes if equipped sound system if anything is getting power without going through a switched circuit this could also be your cause.
hope this helps
Posted on Aug 23, 2009
Testimonial: "Thanks a bunch ithink it needs a high idle "
Would you not assume the ignition switch may have
worn out & possibly be a problem
It gets used a lot
If all power is turned off with that switch & you have a
diesel that keeps running, then you need a mechanic
that knows how to diagnose that issue
Posted on Apr 08, 2014
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