Need help with wiring

Good electrical connections are a must. Solder and shrink wrap all connections. Next, remember good wire is AWG rated. Mulit strand wire is best, infact the more strands, the better current carring capability the wire has. [electrons flow on the outside surface of the wire, therefore, more strands, more current capability] Clean grounds to trunks supports should be sufficient. Clean grounds from the engine block to the frame rail should be sufficient. A full length ground should not be needed, just good connections soldered and shrink wrapped! In the end, any voltage drop should be .5v or less! [insulated side or ground side] Knowing how to use a volt meter is very important when "problems" like this "crop up"!