88 350 TBI ECM Electrical ?

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mrgto

Junior Member
Joined
Dec 12, 2018
Posts
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Location
US
First Name
Mike
Truck Year
1988
Truck Model
r30
Engine Size
350
Hey Guys,

It's actually an '87 350 TBI.

I'm in the middle of trouble shooting my motor. When running Tunerpro RT, it shows that the Battery Volts are low. well under the 13.5-14v that my voltmeter is showing off the alternator. I have an aftermarket 12v Gauge and it's showing what my voltmeter shows.

My question is where does the ECM pickup the 12v "signal' that it's reading.
My thoughts are a bad wire.
 
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