This posting of this subject matter is really what makes this board shine & the members who use it. I am 66, retired & have used some of these electrical solutions in the past. Some solutions I did not know. I have been told that a bad ground is the reason for 50 % or more of automotive electrical issues, even more so in the trucking industry. Some ABF road drivers would not leave the yard until a marker light was repaired. @ 75 bucks a pop from the vendor it got expensive real quick. Even if we had a ladder @ the barn, no one would get on a extension ladder to fix a light 13 feet off the ground. If it was down low, we would just go get one in the fuel bay & change it out saving the ABF money & the driver time. If you ran Omaha, NE (613) miles any delay could force you to bed 50 miles from a terminal. Some would go over their hours just to get there. Now days with the recorder, find a safe place to park & call dispatch. von.