Ford Focus Forum, Ford Focus ST Forum - View Single Post - HID Blowing Fuse????
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Old 07-21-2007, 04:35 AM   #3
SkaAddict
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Could be the ballast or ignitor (black box that screws onto the back of the bulb.) I bought a new set of Mach HIDs and they arrived with both ballasts shot and a bad ignitor...the ignitor on the one kept blowing a fuse every time I'd turn it on. You could try swapping the ballast/ignitor from the known good headlight and see if it works. Or remove the headlights and plug the good one into the bad one's harness and see if the fuse still blows (isolate the problem to the headlight or wiring.) In electrical troubleshooting its typically a good idea to check your wiring by substituting a known good component and see if it fixes the problem, and then narrow down the issue from there. So if you plug your good headlight into the bad one's harness and it doesn't blow the fuse then you know the problem is in the headlight, and if it does blow the fuse then there's a problem with the wiring.
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