Good you don't have starting issues on a regular basis, try putting some Vasaline on the battery posts and connectors, it helps with corrosion etc.
It should be, I usually use the chassis, it's one big long conductor front to rear, I also connect the steel body parts front and rear to the chassis, the reason for my manic addiction to having a good earth is due to problems I've had working on friend's vehicles, a lot of newer cars nowdays have the firewall glued on (Commodore, Falcon, Etc), glue isn't a very good conductor, if a panel shop forgets to reconnect the earth ... headache time till you find the problem!
The first thing I now is check the fuse then I connect a line directly to the battery neg and the other end to the troubled equipment then test for 12v, if that fixes the problem I connect the original earth point directly to a good earth point.
Some people say I'm A.D.D. about earth lines, I prefer paranoid.
One example is the 10mm red and black lines I ran from the battery to the cargo area so the fridge won't have any problems.
Glenn



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