Technical Impala electrical grounding locations?

Question, the 60's Impalas, where were the factory grounds located. Grounds like body to frame, motor to frame? Thanks

 

There should be one at the back of the engine to the firewall. I've seen them at the radiator wall, between that and the voltage regulator, at one mounting screw.

 

been too long to remember...was there a body ground strap at the firewall pass side body bolt? they did have one from pass side rear valve cover bolt to the firewall. The negative battery cable connected to the engine.

this is from memory on a 61 impala

 

I'm picturing something like a ground cable from battery negative terminal to engine block or maybe generator mounting bracket. Then a ground cable from the back of a cylinder head or a bellhousing bolt to the chassis and maybe another to the firewall. There might be another from the frame to the core support as well. At the rear of the vehicle you might add a ground strap from the rear of the frame to the rear body panel area. These cars always seemed to have issues with flakey grounds for the tail, stop and turn signal lamps. More grounds are always better.

 

More grounds aren't necessarily better. Good grounds are better. The light ground issues are usually the result of corrosion in the light sockets or housings, between layers of metal that are crimped together.

 

I had to add a separate ground for all my tail lights to keep the damn things lit on my 61 Imp.

Singlefinger Speed Shop,
still lurking around Detroit

 

Thanks. Been having trouble with the brake lights. Using a free HF vom, in series between the supply/return wires to the brake light switch, getting a whopping 5.5 volts? Maybe the brake light sockets need a good cleaning but there are no grounds from motor to frame or body; negative battery ground mounted on the engine block.

 

try adding a wire from the valve cover bolt to the firewall, or from anywhere else on the engine to anywhere else on the body.

The brake lights go through the turn signal switch too....so many places for problems. Keep using the volt meter, it helps

 

http://www.aa1car.com/library/voltage_drop_testing.htm

This is a super good technique and worth taking the time to understand. Works for everything, starters, charging system, lights, etc.