I am using #1 cables and the negative is bolted to trunk sheet metal. Is it OK to use 1/0 ground strap between the body and engine and another strap between engine to frame?

With short run lengths like that on the ground side, you can run a much thinner cable than 1/0, like 4 or even 8 ga. It can be mathematically calculated but I can't tell you the formula off the top of my head. A thicker cable wont hurt you though except for the added weight. Do a voltage drop test on both the ground and positive cables with the engine cranking. To do that, measure with a volt meter from the positive battery terminal to the positive terminal on the starter. Then also from the negative terminal on the battery to the engine block. If you get a reading more than 0.1-0.2 volts, the wire is either too thin or the connections are dirty, have paint on them, etc. The idea is to have as thin a wire as you can without any voltage drop, with maybe 1 wire gauge thicker for comfort. Since the most current is flowing when the engine is cranking, that's when you want to do this test and the test will only work when current is actually flowing. Here's a handy little chart I found when Google-ing wire sizes too:

http://www.allfordmustangs.com/forum...ingdiagram.jpg

good information:D

All good info and instead of starting a new thread I thought I would post my question. I am going to run the battery cable from the rear to a shut off switch on the dash then to the starter. First cable about 7 ft second about three. What gauge do you think I need to run, thanks
project below;
https://lateral-g.net/forums/showthread.php4?t=44704

I used 1 gauge cable for the negative and positive terminals when I did the rewiring of the battery cables. The car had welding cables and changed to 1 gauge marine cables.

"VSTOL" Harrier pilot?

Semper Fi, 27 yrs on active duty flying A4M and Harriers, and you?

12/74 to 8/79
Multiple jobs,Supply,Accounting, allot of guard duty :D

Last duty station was MARMTD,4th LAAM Batallion, home of the HAWK missile

Semper Fi :Tomcat: :military:

Checkout QuickCar Racing Products. Their cable is very flexible.

Thanks I went to their site and they only go down to 2 gauge wire