 alternator help please |
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| arsprod |
 May 1 2021, 02:07 PM
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#1
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Member  Group: Members Posts: 199 Joined: 14-March 15 From: Indianapolis Member No.: 18,519 Region Association: Upper MidWest  |
Charging light came on recently and I knew the car still had the original alternator. So instead of testing (assume) I just installed a new (rebuilt) alternator. Same problem - light's still on. Also replaced voltage regulator with solid state unit - didn't fix.
With the alternator disconnected from the relay plate the light goes off. I have 12v at each of the 3 pins for the alternator connector at relay plate but nothing from the (new) cable from the alternator. Please don't tell me I have another bad alternator... but do I have a bad alternator? I'm stumped. Ground straps all look find. Thanks! |
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| arsprod |
May 2 2021, 06:38 AM
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#2
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Member Group: Members Posts: 199 Joined: 14-March 15 From: Indianapolis Member No.: 18,519 Region Association: Upper MidWest |
12V at each on the relay board
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| Spoke |
May 2 2021, 07:13 AM
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#3
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Jerry Group: Members Posts: 6,992 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None 
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QUOTE(arsprod @ May 2 2021, 08:38 AM)  12V at each on the relay board Something is not right with your measurements. The 3 signals are DF, D+, and D-. Look at the diagram and notice that D- goes to the alternator and to engine case. The engine case should be a zero volts WRT the chassis and D- should be zero volts WRT the chassis as well. Please provide some detail on how you are measuring 12V at each of these signals. Where is the negative probe of your voltmeter? Attached thumbnail(s) 
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Posts in this topic
arsprod alternator help please May 1 2021, 02:07 PM
Spoke With everything connected as it should be, with en... May 2 2021, 12:47 AM arsprod Yeah, I've stared at this for awhile now. I ke... May 2 2021, 07:18 AM
ClayPerrine
Yeah, I've stared at this for awhile now. I k... May 2 2021, 12:47 PM arsprod
Yeah, I've stared at this for awhile now. I ... May 2 2021, 01:06 PM arsprod Follow up, just returned from rebuilder. "Oh ... May 3 2021, 10:34 AM |
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