alternator not charging and checked everything
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Teching In
Joined: Aug 2009
Posts: 7
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From: Corpus Christi
alternator not charging and checked everything I've replaced the alternator and I've tryed 3 different alternators and the alternators have tested good at both autozone and oreillys. I've also tryed 4 different batterys and I've changed the connection to the alternator. Noting seems to make it better. I checked the resistance in the wires to the alternator and there was no resistance. The only thing I can odd is the exciter wire. I cut I between the computer an alternator connection. When the cars runnin or on the on position with them connected it reads between 4.5 and 6.2 volts. When I have the wires cut I checked both ends and the computer end reads 10 volts and the alternator end is grounded out. When I reconnect them the volts drop down to about 5. I'm not sure if this is rite? Or what could be causing these problems? The volts stay around 11, they never get up to 14 like there suposed to
The PCM controls the regulator with a pulse width modulated signal. So no your not gonna see it with a volt meter correctly.
Any PCM codes?
(I'd clear codes first then run it & see if it sets one with the system whole incase you set some during prior testing)
Any PCM codes?
(I'd clear codes first then run it & see if it sets one with the system whole incase you set some during prior testing)
Thread Starter
Teching In
Joined: Aug 2009
Posts: 7
Likes: 0
From: Corpus Christi
I checked the reistance again and on the cable from the battery to the alternator it had .07 and the from the battery to the fuse box it had 14. Also I'm sure how to check the continuity? An the gauge reads bout 10 volts inside the car
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If the alternator tests good and you have the belt routed and tensoned properly and the voltage starts at 10V and never goes up - cances are it's an exciter wire problem.
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Verdad Gallardo If the exciter has the same voltage as your battery, it is good. Jump the car and hopefully it will charge up. Your problem may have been a bad exciter connection originally.
Thread Starter
Teching In
Joined: Aug 2009
Posts: 7
Likes: 0
From: Corpus Christi
Fixed the problem. If anyone else has this problem, the exciter wire (red wire that connects to the alternator) has a bad connection. I replaced the connector an part of the wire and problems are fixed now
