Intermittent Elctrical Power Issue - Page 2 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Grady · 09-10-2021, 04:26 PM

If you get around to checking the voltage drop on the ground wire here is a reference to verify your readings. This is a normal start of mine. Measurement was read between battery negative terminal and engine(alternator).

As you see during start there is about a .41v drop on the negative lead. My guess is about a 150 amp spike(I did not measure amps). If your starter was shorted and put a 300+ amp load you would get around a 1 volt drop.

humfrz · 09-10-2021, 05:27 PM

Quote:

Originally Posted by RZNT4R

He just changed it.

.

my bad -

RZNT4R · 09-10-2021, 06:40 PM

So yeah haha a few hundred mV

Sure would have been a shame to come up with a BS number like that to begin with huh?

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09-10-2021, 06:40 PM	#17
RZNT4R Professional Mechanic Join Date: Apr 2010 Drives: 2017 86 6MT Oceanic Location: Quebec, Canada Posts: 789 Thanks: 17 Thanked 634 Times in 371 Posts Mentioned: 12 Post(s) Tagged: 0 Thread(s)	So yeah haha a few hundred mV Sure would have been a shame to come up with a BS number like that to begin with huh?

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