Join Date: Mar 2002
Location: Austin, TX, USA
Get a digital volt meter and connect one of it's leads (ground / black) to the negative terminal of the battery. It might help to have an extension wire on the ground lead. Then start probing grounds with the electrical system on. You should see more that a volt on a heavily loaded ground. In most cases in will be less than 1/2 volt IMO. The readings vary somewhat. But if you find a spot where you get a big rise in voltage, you've located your bad ground. Look for missing or corroded bonding straps etc.
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI