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No need to buy expensive harnesses. You need two cube relays, some number 12 wire, yellow connectors, and H4 headlight connectors. Very simple. The whole idea is you want the headlight switch to operate the relays. One for high and one for low. Right off the battery positive. The rest of the original Jeep wiring is plenty heavy enough. I can provide more details with pics if anyone is interested. I've been repairing electrical systems and wiring European cars for 30 years...never have a problem. Go to a website for a company called Winzer for anything you need, or locally at Advance auto. Except the high output bulbs. Winzer has those.
 
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