dpellet Posted September 30, 2007 Share Posted September 30, 2007 Hi, Anyone familiar with the conversion of 9004 to H4 (Celsior) headlights, I have a jdm set and would like to install on my us spec ls400 but the H4 set up is different. I do have the h4 plug in but am not sure how to wire it up. Any assistance or a point in the right direction would be apprecited!! CHeers! Quote Link to comment Share on other sites More sharing options...
1990LS400 Posted September 30, 2007 Share Posted September 30, 2007 In the past, I've used a 12 volt test light to determine the functions of each wire leading into the OEM headlight connector. Sometimes I did a little experimenting. I've done it "both ways" with converting from non-H4 to H4. On some cars (e.g. Hondas) I have left the OEM connector in place and t-tapped into the wires leading to it, connecting the wires from the t-tap connectors to the new H4 plug. On other cars (e.g. Mercedes), I've removed the OEM headlight connector because the OEM connector was designed to plug into a U.S. spec Mercedes headlight housing and not directly into the bulb. But I have not done an H4 converson on a Lexus -- only on three Hondas, one Volvo, one Mercedes and on a variety of American cars of family members. Here is a webpage which shows which shows the function of each spade on an H4 bulb: http://www.vintagewatercooleds.com/tech/Te...nnector_Diagram Here is another webpage which shows the function of the each terminal on both an H4 and a 9004 headlight connector: http://www.4crawler.com/4x4/CheapTricks/Headlights.shtml Quote Link to comment Share on other sites More sharing options...
dpellet Posted September 30, 2007 Author Share Posted September 30, 2007 Thanks very much for the links, I was thinking I would tap in and leave the stock connectors as well. I'll have a read and post the results once done. Thanks again! Quote Link to comment Share on other sites More sharing options...
dpellet Posted October 1, 2007 Author Share Posted October 1, 2007 FYI< on jdm headlight swap. Had to splice in the h4 connectors, once done according to the links above it work.. Thanks again, this forum is awesome! Quote Link to comment Share on other sites More sharing options...
Jify Posted October 2, 2007 Share Posted October 2, 2007 I've done the swap myself, but haven't documented any of it. Glad to hear you got it working. :) Quote Link to comment Share on other sites More sharing options...
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