robfg67 Posted July 9, 2023 Share Posted July 9, 2023 Full of (easy) questions this morning... I added the Putco headlight wiring harness toi the MJ recently and want to add an in-line fuse to protect the harness. 1. What size fuse should I use? 2. Should I add a fuse to each red wire going back to the positive battery cable? And, yes, I ordered "better" relays to replace the crappy ones that come with the kit. Link to comment Share on other sites More sharing options...
gogmorgo Posted July 9, 2023 Share Posted July 9, 2023 Should be fused to just over the max current you expect to draw. Assuming stock 60 watt bulbs amps = watts/volts = 60W/12V=5A. Thats per bulb, so 10A should do it for both bulbs. The other more important factor is what the lowest rated component in the system is good for, so that your fuse actually stays the weakest link in the system. Usually this won’t be a factor given your circuit should have been designed for the full load. But generally the big concern there is the wire diameter, or guage. If they’re running 16awg wire, 10A is about the most you can safely run through it so you wouldn’t want to fuse above that. If it’s 14awg you can generally run up to 15A without worrying about the wires becoming the fuse instead. Link to comment Share on other sites More sharing options...
robfg67 Posted July 9, 2023 Author Share Posted July 9, 2023 Makes perfect sense, thanks. I'll check the gauge of the wire and go by that. I still have the stock 60W headlights. Link to comment Share on other sites More sharing options...
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