fluctuating voltage, bang shifts and a puff of smoke. is it related? - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 12-04-2013, 05:46 PM   #11
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Jason I would trickle charge that battery overnight and have that battery load tested so u know if it is still in the good, bad, or ugly range.
Batteries do fail more often and or less CCA is available as it gets colder... things start to show up quick.
Where alts are opposite, as they get hot... things can go awonk.
Here is a Snap On chaging system analyzer at work...

This home load tester gives me a 100amp load (with car post terminals off) and a decision about state of charge real quick. It works well and I know if the battery is weak real quick.
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Old 12-04-2013, 09:06 PM   #12
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wow, pretty neat tester, we dont have anything digital. not for load tests anyway.
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Old 12-04-2013, 09:53 PM   #13
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well, the dude at AZ said that the load test said 115 amps, and the battery was at 99% with 12.6 volts. the alternator was putting out 13.3 volts after starting the car. today, the alternator acted absolutely perfect for the most part. it was 55*F today. as for the cooling fans, they dont kick on very often if at all when it is under about 40* because of my giant grille. and the compressor is DOA with the relay pulled. i use a t fitting with a schrader valve for the shocks. with how sporadic it is, and the fact that it is OE i am leaning toward the alternator. ive had an optima drop a cell before, and this is nothing like when the battery went.
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Old 12-05-2013, 07:19 AM   #14
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Here are the specs on that Snap On Machine...Load test and elec system diagnostics...
Will give you the condition of diodes and/or stator windings !!
Heavy Duty AVR, Battery Load Tester, Electrical System Diagnosis
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