Alternator Testing - GM
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Date: 2020-08-05
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Comments and reviews: 10
Dan
My friend at work is repairing his brother's car that isn't charging. It's a Chevy Malibu with the ECM controlling the alternator. He was asking me about it but I've never had experience with the ECM controlling the alternator but I just now got some schooling. Thanks. I thought I got electrical drawings before from AutoZone but today when I went there all I could find is a subscription service from AllData DIY. Can you tell us how you deal with electrical drawings and repair information for cars and how you get your info? Do you buy repair manuals or get your info on line? Thanks.
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My friend at work is repairing his brother's car that isn't charging. It's a Chevy Malibu with the ECM controlling the alternator. He was asking me about it but I've never had experience with the ECM controlling the alternator but I just now got some schooling. Thanks. I thought I got electrical drawings before from AutoZone but today when I went there all I could find is a subscription service from AllData DIY. Can you tell us how you deal with electrical drawings and repair information for cars and how you get your info? Do you buy repair manuals or get your info on line? Thanks.
reply
Garth
Those alternators usually burn up the voltage regulator or rectifier first. A bag of new parts that includes two new bearings, regulator and rectifier are available for a cost of about 30 plus, you can install premium grade bearings that are wider if it will apply and a more robust voltage regulator (XHD. Most shops won't rebuild them due to the labor cost would exceed a new or rebuilt one however, if a customer wants premium parts inside, at least they are available versus tracking down a premium alternator as most parts houses don't stock them.
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Those alternators usually burn up the voltage regulator or rectifier first. A bag of new parts that includes two new bearings, regulator and rectifier are available for a cost of about 30 plus, you can install premium grade bearings that are wider if it will apply and a more robust voltage regulator (XHD. Most shops won't rebuild them due to the labor cost would exceed a new or rebuilt one however, if a customer wants premium parts inside, at least they are available versus tracking down a premium alternator as most parts houses don't stock them.
reply
Bill
Thanks for the time and video. My GF's 2010 Treverse's new battery is going dead after a few days. I found a. 161 amp draw and have not traced it down yet. However, while driving it, I noticed that the alt voltage, starts at 14. 3 but within 45 sec it starts dropping over a minute or two to what the battery voltage shows when I start it, 12. 4. I'm not much of a mechanic, but this seems like alt/voltage reg issues. Would you be so kind as to comment?
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Thanks for the time and video. My GF's 2010 Treverse's new battery is going dead after a few days. I found a. 161 amp draw and have not traced it down yet. However, while driving it, I noticed that the alt voltage, starts at 14. 3 but within 45 sec it starts dropping over a minute or two to what the battery voltage shows when I start it, 12. 4. I'm not much of a mechanic, but this seems like alt/voltage reg issues. Would you be so kind as to comment?
reply
Clinton
I had a 1995 Ford Windstar and the first indication that anything was wrong with the alternator was that the lights on the instrument cluster went dark, the engine quit and I just barely coasted to safety on the shoulder of the road. The alternator light never came on. Can anybody tell me why or how the alternator could fail and the battery discharge without lighting the warning lamp?
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I had a 1995 Ford Windstar and the first indication that anything was wrong with the alternator was that the lights on the instrument cluster went dark, the engine quit and I just barely coasted to safety on the shoulder of the road. The alternator light never came on. Can anybody tell me why or how the alternator could fail and the battery discharge without lighting the warning lamp?
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elizabethkkb
I have a 2007 yukon denali xl 6. 2 has the service battery charging system light on, I went to get it tested and they tell me battery is good, alternator is good, and starter good. So what's wrong? charging system for the a/c also hasn't been working we have to keep refilling it, oil pressure goes up and down as welll. I'm not sure what's going on any help would be nice.
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I have a 2007 yukon denali xl 6. 2 has the service battery charging system light on, I went to get it tested and they tell me battery is good, alternator is good, and starter good. So what's wrong? charging system for the a/c also hasn't been working we have to keep refilling it, oil pressure goes up and down as welll. I'm not sure what's going on any help would be nice.
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Jesse
I have the same Mac cordless 1/4 ratchet and have learned the only way to get stuff out with it is the same trick. get it spinning and then hit the nut/bolt. Bought it used with 1 battery for 100 off the tool truck. Only advice the mac guy gave me was dont break the head. It costs almost as much as a new unit to replace it. Also the 3/8 head is interchangeable
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I have the same Mac cordless 1/4 ratchet and have learned the only way to get stuff out with it is the same trick. get it spinning and then hit the nut/bolt. Bought it used with 1 battery for 100 off the tool truck. Only advice the mac guy gave me was dont break the head. It costs almost as much as a new unit to replace it. Also the 3/8 head is interchangeable
reply
report7777
my alternator test ( auto parts store came: something like voltage regulator fail ) the alternador is charging but not as suppost to be. the belt tensioner dvice is bad aking a lot noise ( mecanic think might be just the belt tensioner? i dont want to go back twice is my second alternador ( remain ) thank you
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my alternator test ( auto parts store came: something like voltage regulator fail ) the alternador is charging but not as suppost to be. the belt tensioner dvice is bad aking a lot noise ( mecanic think might be just the belt tensioner? i dont want to go back twice is my second alternador ( remain ) thank you
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James
That's why I don't shop car quest. Not that I haven't been burned by napa, but that incident was actually the wrong part in the correct box. In 15 years over had 2 cases like that with napa. In the last 3 years I've had experiences like yours 7 times. Dealership parts 2 times providing vin #
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That's why I don't shop car quest. Not that I haven't been burned by napa, but that incident was actually the wrong part in the correct box. In 15 years over had 2 cases like that with napa. In the last 3 years I've had experiences like yours 7 times. Dealership parts 2 times providing vin #
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bill
gm battery current sensor testing like to see that Regulated Voltage Control PCM Controlled Charging System duty cycle on multimeter or
Hantek 2d82auto automotive oscilloscope 2d82 auto digital portable handheld 4in1 3in1 2c42 2d72 2d42 2c72 2d82 will that work
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gm battery current sensor testing like to see that Regulated Voltage Control PCM Controlled Charging System duty cycle on multimeter or
Hantek 2d82auto automotive oscilloscope 2d82 auto digital portable handheld 4in1 3in1 2c42 2d72 2d42 2c72 2d82 will that work
reply
Brian
Had the charge light on my old Land Rover freelander 2, garage had the car three days, chucked TWO alternators at it before they got a sparky to test the wiring and yes, one small broken wire from the alternator was at fault, a common issue on this model.
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Had the charge light on my old Land Rover freelander 2, garage had the car three days, chucked TWO alternators at it before they got a sparky to test the wiring and yes, one small broken wire from the alternator was at fault, a common issue on this model.
reply
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