Cable Clamps and Protect the Cable
Hi
Lynn and Ken's point about the welding cable are on the mark. Adding a ground cable from the battery ground to the chassis to the engine will cure a lot of problems. I've gone over to generally making my own cables using heavy welding cable or heavy fine wire cable from electrical supplier. While your at it get the lug ends from them I like to crimp the lugs on to the cable and while they are nice and clean solder them as well for the best electrical conductivity.
Be sure though that when running your power side of the cable that you use cable clamps to keep the cable in place. Check your routing to be sure of any points were it rubs against anything. One problem with the welding cable that I have encountered is that the insulation is little softer than I'd like and is prone to wearing through. I had a cable fire because of this on a new installation, my own fault didn't have enough cable clamps.
When I replaced the cable after the fire I slid a section of hose over it at the wear point.
Cheers Phil
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