 Alternator test off car - Can I? / How do I? |
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| Wyvern |
 Dec 19 2019, 08:29 PM
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#1
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Member  Group: Members Posts: 324 Joined: 7-October 15 From: San Francisco (East Bay) Member No.: 19,245 Region Association: Northern California  |
Can I test my alternator off the car?
I have a choice of 2 units and would like to test. My local parts store says they cant test it out of the car, only when installed. Thanks |
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| bretth |
Dec 20 2019, 11:14 AM
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#2
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Senior Member Group: Members Posts: 899 Joined: 23-June 15 From: Central TX Member No.: 18,882 Region Association: Southwest Region |
I wonder if you could secure it in a vice and spin it up with a electric drill off of the pulley nut. Of course you would need to have a load on it and wire in a portion of the charging system somehow.
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| Spoke |
Dec 31 2019, 01:00 PM
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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(bretth @ Dec 20 2019, 12:14 PM)  I wonder if you could secure it in a vice and spin it up with a electric drill off of the pulley nut. Of course you would need to have a load on it and wire in a portion of the charging system somehow. The RPM's might be an issue. In the vehicle, the alternator spins about 3x as fast as the engine. Thus at 1k RPM, the alternator is spinning at 3k RPM and normally to get the alternator up to 14V one normally needs to increase the engine speed to 1500 to 2k RPM (6k RPM on the alternator). Most drills do 1k-1.5k RPM. High speed drills might do up to 3k RPM. As you mention, it's the loading that will stress the drill test. |
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Posts in this topic
Wyvern Alternator test off car - Can I? / How do I? Dec 19 2019, 08:29 PM
Mark Henry
Can I test my alternator off the car?
I have a ch... Dec 19 2019, 08:37 PM Tdskip +1 on that recommendation Dec 19 2019, 08:56 PM cary Walked right into NAPA. They have a tester. Take i... Dec 20 2019, 08:49 AM DickSteinkamp
My local parts store says they cant test it out... Dec 20 2019, 10:09 AM bbrock Called my FLAPS who assured me they could test an ... Dec 20 2019, 10:25 AM
76-914
I wonder if you could secure it in a vice and spi... Dec 21 2019, 01:41 PM saigon71 My local Advance Auto parts was able to test mine ... Dec 20 2019, 04:26 PM
Big Len
My local Advance Auto parts was able to test mine... Dec 31 2019, 05:04 PM Wyvern NONE of the local shops can do this . A Zone, ... Dec 31 2019, 11:43 AM mepstein Our local auto battery shop rebuilds starters and ... Dec 31 2019, 12:05 PM |
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