I've just replaced the battery and the altenator and it ran fine for a week. I brought both back to the store where I purchased them to be tested and they both tested good. The truck will start but won't run or idle. The voltage display shows 9 volts, but the altenator output is 14 volts. When it dies the battery warning light comes on the message center display. I tried to jump start it and the same thing happened.
Check quick connect plug on alternator .see if conection or wiring is good. also checkthe fuse, they tend to blow when you instll your new alternator if you create an arc.last check your belt and tensioner. with key out of ignition! see if you can spin alternator blades with belt on. if so tensioner is bad
SOURCE: 1997 Satrun SL 2 alternator failures
Miserable engineering.
My '95 SL2 purchased new, ate 6 (SIX) alternators, that fantastic "27 patents" automatic transmission, two sets of front disks and finally dropped a rod cap at 56,700 miles of very civilized driving.
I 'sold' it to my youngest son for $1 as a hobby when he got bored with his Jeeps or to donate it to a fund-raising bashing contest.
Now, the reason the alternators die -
They are buried in the engine compartment and get hardly any natural cooling there and, I don't know what kind of stupid engineers GM employs these days, but that alternator at 105 amps rating must deliver up to 1200 watts of 12 volt power an d it is too small to effectively dissipate the 1200 watts of sheer heat it produces while doing it.
If you have any appliance that absorbs 1200 watts (10 amps at 120 VAC), just check to see how much heat that is and even if spread over a larger area and bulk of the alternator, you think that would be a good environment for the semiconductors that are used to make the DC and regulate it.
It's a absolutely insane design and convinced me to never, EVER buy another anything from GM!
Sorry to vent but it still irks me after over 4 years of trouble-free Subaru ownership.
I wish you luck.
SOURCE: 99 discovery/ dies while driving
sounds like the belt is loose. if it has a tensioner check and or replace it, if not tighten the belt. or the alternator tests ok but is actually not working at low rpm. or the battery is shorted. electricity is tricky
SOURCE: 03 chevy silverado, problem with
if the alternater light is not on the battery.probably has a bad cell
SOURCE: 2002 GMC Sierra High Voltage
could be just a bad gauge,thak it too auto zone and have them test it while its on the truck,if it reg the same on their tester then your got a short
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
Testimonial: "Thanks a bunch ithink it needs a high idle "
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