Originally Posted by rockp2

Just to clarify, the voltage drop test described doesn't check the EBCM itself (I should've pointed that out). Rather it checks to see if there is high resistance in the ground wire itself between the EBCM and the ground G110. If there is a voltage drop, then there is probably corrosion in the wire and replacing the ground wire could solve the problem. The EBCM is susceptible to high resistance.

Theoretically, if he did have a voltage reading above 100mv (indicating high resistance in the ground wire) he could:

1. Leave the voltmeter installed as described
2. Take a fused jumper wire and attached to the B(-) post
3. Starting at the G110 side of the ground wire, cut/strip the ground wire back a couple inches at a time
4. Connect the fused jumper from B(-) to the ground wire at the cut/strip
5. KOEO, foot on brake, check the volt meter (obviously this will be much easier with a helper)

Once the volt meter drops to 0 volts (+/- 100mv), that's the spot he cop splice in a new wire and run the new wire to G110. Then do the original voltage drop again to confirm he has achieved good ground. Then disconnect the volt meter (not forgetting to remove the T-pin!), and see if he has a fix.