Voltage drop/load testing grounds

[Brad Clayton]

This is a Cmax hybrid with a questionable BCM ground.

 

I like to use the ol power probe for a voltage source, its fused, and easy to switch power on and off. A volt meter, and headlight bulb. This bulb has a nice harness hooked to hit for low and high beam operation and I can jumper it without having to worry about my jumpers shorting out due to an available ground in each connector.

 

 

First, I locate the ground at the BCM connector and then use an appropriate terminal to jump it out with.

 

 

I hook the power probe to the power side of the bulb and hook the ground side of the bulb to the BCM ground. I hook one lead of the meter to the ground at the BCM and the other lead to the ground lug in the sill plate under the carpet.

 

 

After powering up the bulb it should be nice and bright and the voltage should be very low, in this case 50 millivolts, well within spec. So this ground is A-OK.