DELInstallations, I thank you for your response. I haven't done any extensive troubleshooting. I had only measured the +VKP to Neg and received +13.84 volts.
Inspired by your list, I measured the following on the M1: Neg to Data B=1.43v to 1.75v, Neg to Data A= 1.29v to 1.41v, Data B to Data...