2014 Suburban Electrical gremlins

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Those are voltage tests.

Good voltage DROP tests should be very low, not B+ voltage. The point is to read the "potential" between two contact points that should have a very low difference. So loading the circuit and reading the voltage between the two contact points (positive to positive; and negative to negative).

 

[Doubeleive]

That was kind of my thought. I found the oem replacement cable for $64 on amazon but dont want to continue guessing.

I just did 2 voltage drop tests starting the truck.
1) from the positive battery terminal to the engine block ground at the cylinder head. Result was Max 14.9 volts and min 10.68.
2) from the negative battery terminal to the ring terminal at the end of the starter positive cable at the starter. Max was also 14.84 and min was 10.4.

This doesn't seem like a meaningful difference does it?

My next step is to drop the dome light housing and look around in there. Fingers crossed I dont break the plastic

technically 10.4 at the starter is a fail, but unless it's not starting properly then that is probably not the problem
gm considers 10.5v to be the bare minimum
I would move on from the starter cable for now and poke around elsewhere

 

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