Originally Posted By: tinmanSC
I've made a home-brew grounding harness for the car from 4 gauge wire, a bunch of lugs, some solder, and a few hours. It works great. I made 7 or 8 cables (i don't remember how many) and connected them to many points on the engine and body. I got my hands on a manual for the SC300 that details all the grounding points and used that as a starting off point, connecting to a few other points and then to the battery. It works great and the issue seems to have been resolved! woot!
Nice work! Cleaning the grounds is a very important, fairly easy & often overlooked source of wonky electrical gremlins. On my aging mk4 VWs, it's typically step zero for diagnosing electrical problems.
Glad it seems to be fixed - and keep us updated.
