alt problem
Thread Starter
Instructor
Joined: Aug 2017
Posts: 179
Likes: 42
alt problem
so last night on my way back home from vegas .i stopped to stretch and my car wouldn't start again . got a p1637 and 8 code .
so i towed it home charged the battery last night it's a 12.57 now check voltage to large red terminal on alt 12.52
started car dtc shows 11.2 voltage and service light and codes are back
i checked connections at starter found that my starter bolts where loose
tightened them . didn't feel any loose wires on the solenoid.
fired it up and still 11.2
checked 4 pin connector have 12 v on one red ign off and 10v on other red ign on.
thinking the starter being loose just fried the voltage regulator
so i towed it home charged the battery last night it's a 12.57 now check voltage to large red terminal on alt 12.52
started car dtc shows 11.2 voltage and service light and codes are back
i checked connections at starter found that my starter bolts where loose
tightened them . didn't feel any loose wires on the solenoid.
fired it up and still 11.2
checked 4 pin connector have 12 v on one red ign off and 10v on other red ign on.
thinking the starter being loose just fried the voltage regulator
Melting Slicks
Joined: Jan 2009
Posts: 3,275
Likes: 739
From: Miami FL
...i checked connections at starter found that my starter bolts where loose
tightened them . didn't feel any loose wires on the solenoid.
fired it up and still 11.2
checked 4 pin connector have 12 v on one red ign off and 10v on other red ign on.
thinking the starter being loose just fried the voltage regulator
tightened them . didn't feel any loose wires on the solenoid.
fired it up and still 11.2
checked 4 pin connector have 12 v on one red ign off and 10v on other red ign on.
thinking the starter being loose just fried the voltage regulator
Turn on the car and with a multimeter read the voltage at the alternator (and verify if the alternator is working as it should) and then at the battery. These voltages should be basically the same, otherwise something is wrong in the alternator-starter-battery chain. If that is the case, check the 2 fusible links between the alternator and the starter.
Last edited by GCG; Apr 23, 2018 at 03:19 PM.
Thread Starter
Instructor
Joined: Aug 2017
Posts: 179
Likes: 42
k i'll check the link tonight the car starts right up and not having but a .05 drop from battery to alternator drop makes me think the starter connections are good i did try and move them and they where all tight but mind you it was 3am .
yeah there is no voltage change at the alt when running and checking the second red excite wire makes me believe alt
yeah there is no voltage change at the alt when running and checking the second red excite wire makes me believe alt
Melting Slicks
Joined: Jan 2009
Posts: 3,275
Likes: 739
From: Miami FL
Just a bit of advice: If you verify that your alternator is bad, don't give it as a core. Plenty of horror stories here. You can replace the regulator. Take a look at this post. It has info on the right regulators for both, 97-01 and 02-04. The price is around $30.
Last edited by GCG; Apr 23, 2018 at 04:35 PM.
Drifting
Joined: Feb 2008
Posts: 1,596
Likes: 67
From: Bahama North Carolina
k i'll check the link tonight the car starts right up and not having but a .05 drop from battery to alternator drop makes me think the starter connections are good i did try and move them and they where all tight but mind you it was 3am .
yeah there is no voltage change at the alt when running and checking the second red excite wire makes me believe alt
yeah there is no voltage change at the alt when running and checking the second red excite wire makes me believe alt
Thread Starter
Instructor
Joined: Aug 2017
Posts: 179
Likes: 42
nope alt is not charging 1 red pin at the alt is hot at 12v with ignition off the other red has no power num 3 left to right
but with key on i have 10v at alt plug red wire number 2
so i work at carquest got a reman bosch tonight but some moron dropped it and cracked case so i get another tomorrow night i'll keep you filled in
but with key on i have 10v at alt plug red wire number 2
so i work at carquest got a reman bosch tonight but some moron dropped it and cracked case so i get another tomorrow night i'll keep you filled in
Last edited by darkling; Apr 23, 2018 at 09:54 PM.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Before just replacing the alternator on your C5 with just anything, I suggest that you read this thread:
https://www.corvetteforum.com/forums...nd-issues.html
A better alternative might be to have yours rebuilt using this:
https://www.corvetteforum.com/forums...post1591319135
as suggested by GCG in post #4 above.
https://www.corvetteforum.com/forums...nd-issues.html
A better alternative might be to have yours rebuilt using this:
https://www.corvetteforum.com/forums...post1591319135
as suggested by GCG in post #4 above.
BC
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