Originally Posted by buick

I'd highly recommend soldering them as well. The vibrations/movement from the motor and travel can really loosen things up.

Also, did you replace your big three? 1) alternator positive to battery positive, 2) battery negative to chassis, and 3) engine ground to chassis

good write up on this upgrade

The absolute ground of your electrical system is not your neg battery terminal, but the case of the alternator. Assuming the alternator is properly bolted to the engine, your block to chassis ground is your most important ground. It's usually one of those pansy braided flat cables from somewhere lower down on the block to the chassis.