motorcycle headlight with single spdt relay


Posted on Feb 5, 2014

A bike with 35 watt HS1 bulb and I want to upgrade brightness of headlight so I decided to put H4 60/65 watt xenon bulb. An expert on this forum suggested me to use relays as the new bulb requires more power. I did some google to understand relays and how to wire new headlight with relays, but the confusion is that the links and videos for relay wiring that I found online was for cars and car has two head lights


motorcycle headlight with single spdt relay
Click here to download the full size of the above Circuit.

so they have used two SPDT(Bosch) relay for that but for my bike I need only one bulb so I guess single 30 AMP SPDT relay would be enough but I am confused what should be the circuit diagram for single SPDT relay to control headlight HI-LO beam. I know instead of making setup from scratch by myself many of you would suggest me to go for Eastern Beaver H4 kit but the problem is that I am in India and I dont have any paypal account to pay for kit and even not sure whether this kit would be economical for me or not thats why I decided to make this setup by myself. I have 30amp SPDT relay, 30amp fuse holder and H4 xenon bulb and I need help of the experts on this forum to please guide me on how wire new headlight. A simple circuit diagram would be enough like this one at earlycuda. org:




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