Join Date: Aug 2009
Location: Washington, the state
OK to run multiple wires in one or two looms, whatever fits. If it works for you, you can run one large gauge negative for all the items. You do need a negative that runs to the battery negative post or the fuse block negative bus.
Pick the wire gauge by the expected load, and the fuse size by the wire gauge.
My headlight relay power comes off the fuse block; you can do it either way. I run my horns directly off the battery, they are the heavy load.
"Older people who are reasonable, good-tempered, and gracious will bear aging well. Those who are mean-spirited and irritable will be unhappy at every period of their lives.
"Let each of use properly whatever strengths he has and strive to use them well. If he does this, he will never find himself lacking."
Marcus Tullius Cicero