1999 GMC Safari Q&A
1999 GMC Safari Question: why wont my 1999 gmc safari hold a charge as far as battery alternator goes.
Are you saying that the battery wont hold a charge or the charging system isnt working? It the battery is losing the charge, (it goes dead) after a day or so then you should be looking for a current draw. Something is staying on and killing the battery. If the charging system isnt working then you need to do some diagnostics to see why the alternator is not doing its job. - Herb Ackside
wow, three batteries and three alternators...why didn't you get ANOTHER alternator? anyway, Jae Mak...sounds like you have an issue with the alternator not charging...you have to find out what wire is missing or broken. - your.mechanic
Pull the alternator off and have it 'bench tested'. IF it checks out good , leave it off truck. Next , fully slow-charge battery and then buy a multi-meter. Then get a wiring diagram of charging circuit and perform input/output and continuity tests on appropriate wires. Probably failed signal wire to alt. VERIFY FIRST!!! Before putting on more parts.........IF alt. bench tests bad then have the next one you get bench tested before you leave the store with it. Then troubleshoot vehicle before installing alt. Good luck. - ziptie12