alt check w/ OBDII? (1 Viewer)

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Can you check if the alt is working by checking the streaming data in an OBDII?

Truck starts after a jump, but when running only gets to 12.2 on both batteries (one at 12.3 and one at 12.1).
 

Photoman

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I don't think you need the OBDII. Just put your headlights etc. on so there is a draw to pull in the alternator, and check across the pos and neg of the battery. It should read approx. 14.4v. If it doesn't the alt. is probably bad. If you are specifically asking if it can be checked with OBDII, I don't know.
Bill
 

Gumby

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Yes. You can check for battery voltage to the ECU with most scan tools. It will not tell you more than voltage. A voltmeter would tell you that for about $2000 less.
 

Photoman

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Thread Hijack - I finally got to talk to the Alt. shop that used to do much of my business starter/alt. work about how to test an alternator for the amount of amps it puts out (Mean Green etc.) They told me to hook up an amp gauge between the post on the alt. and the wiring. It must be tested under a very large load - equivalent to the alt output. He said they use something called a Carbon Pile (sounded like something like I had removed from my Carbon butt) to load the alt. for the test. I see Northern Hyd. sells such a thing, 500 amp $299.00. He said he would be glad to test the Mean Green for me but didn't think much of an alternator in such a small case supposedly putting out such a large amount of amps and lasting very long.
Bill
 

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