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Re: Changing from 9004 to H-4; which wire is which? 200 89

posted by  someone claiming to be JohnB on  Thu Nov 30 07:13 CST 2000 [RELATED]

I can never remember so I just probe the 9004 socket on the car to see which one is hot and which is not with high/low beams....since I assume you wish to hook up your 9004 car wiring to the new H4 bulbs? Then I just use a couple alligator clips and wires to test fire the H4 bulb...use your ohmeter to find the common/ground, then use the battery to fire the bulb and it's generally easy to see which terminal is the bright one. If you want to keep it clean you can clip the 9004 socket and wire the H4 socket directly, or as I prefer, leave the 9004 socket on there and tap into the correct wires to activate separate 40A relays for high and low with the relays controlling direct taps to the battery.





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