Join Date: Mar 2002
Location: Austin, TX, USA
Re: electrical polterguist 1971 ss/rs
Not sure exactly where the grounds are on your 71, but there is an easy way to check the condition of your grounds. Since the problem seems to be in the rear, get a digital volt-ohm meter and measure between the tail panel (or other grounded surface near the lamps) and the negative battery post. You'll probably need a piece of wire, a jumper cable, or an extension cord to "stretch" you meter lead so it will reach. You should see a very slight reading on your DVM (less than 0.05 volts or so). Then turn on the head lamps and see if the reading changes. If it does repeat your test between the negative post and the right front fender. If you see similar readings check the ground lead from the negative post to the fender. If the readings are different, you may have a ground issue between chasis panels and / or the frame. Grounds can be difficult to track down, but the DVM trick should help you narrow it down. Other grounds to check would be the under-dash area, steering column, etc.
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI