Deciding on a good ground point in the trunk

[Setuck]

Is the floor of the trunk a good point for a general ground for the car?

The battery is in the trunk.

Thanks

[tashakes]

This is how my trunk battery is hooked up, has worked for decades.  

[Greg Mierz]

On the early cars the rear deck has bolts for what would have been shoulder belts, I used that welded to the body for mine 40 years ago and it works perfectly.

 

[2002iii]

Yes the trunk floor is good, just make sure you clean the surface before you bolt it down.

[jimk]

For battery ground, I bolted it to the brace that the trunk lift bracket because the battery is to the right side of the trunk and the power lead follows the right side of the car to the firewall in the engine compartment.

[Greg Mierz]

Just remember you'll need some real good grounds up front with the battery in the trunk from body to motor.

[dlacey]

I grounded to the hinge bracket in the top corners of the trunk...sturdy 8mm stud there.

[PhilC]

I have a battery tray welded to the boot (trunk) floor and the ground is bolted to that. It may be a battery tray from an E30 or such like.

Edited March 5, 2023 by PhilC

[TobyB]

Me, I'd pick something a bit stouter than the sheetmetal of the floor.

Just because I've spot- welded, and it doesn't take all that much

current to make a nice spot weld to thin metal.

 

If the floor's best for your particular routing,

then, use a pair of backing washers to give yourself

more area, and remember that the more VOLUME of metal, the better it

will conduct.  So a couple of thick fender washers will do a pretty good job

IF they make good contact to the sheet in a large area.

 

t