I just finised wiring my new bottom up custom bike. The rear and front LED indicators, digital speedo ach, brake unning lights all with running features work correctly and are a bright as a Xmas tree...unti i connect my headlight. I then loose half of the LED's on the brake light and the indicators are hardly visable. Any suggestions would be fantastic!
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Re: motorcycle wiring issue
Who's harness are you using ? When I wired my custom, I ended up calling the maufacturer more than once. On the surface, it sounds like your headlight is just drawing more power than your bike is generating. Does this happen when your bike is running ? If so - is it charging correctly ?
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I had the same issue on my GL1800. Turns out I had a bad ground in the brake light circuit. It was my major pin connector under the seat. I'm sorry if this doesn't help, but it sounds like a bad ground.Try checking the connectors for the rear brakes. Disconnect and clean each pin connector. If that doesn't work, maybe run a jumper line from a brake light ground to a frame ground source. If the lights come back on, the ground is the issue.
Hi Anonymous, this problem is usually cause by the front brake light switch being out of alignment or the button not retracting all the way keeping your brake light on in a closed circuit, depending on your model year. 1996 and earlier models the right handlebar switch housing had to be tight up against the front brake control housing in order for the front brake light switch button to be fully compressed to stop continuity. In 1997 and later models the button was alot shorter and was more of an alignment issue in the switch housing. Rear brake light switches located in the rear brake line TEE can also fail in the closed circuit condition but extremely rare, usually they fail in an open circuit condition where the brake light is not able to activate. For a free wiring diagram please visit the website below and good luck. Harley Davidson Wiring Diagrams and Schematics
There are two brake light switches on your bike. One for the front brake and it's located in the right handlebar switch housing and a pressure switch that is usually underneath the bike somewhere for the rear brake. You can find the rear brake light switch by following the metal brake line that comes out of the rear brake master cylinder until you come to a switch with some wires on it. On the older bikes, you could unplug the wires to see which switch was holding the light on. If the brake light goes off when you unplug the wires, it's this pressure switch that has the light held on. If the light stays on, it is the front brake light switch. On your bike, check for looseness in the front brake lever. If the lever and pin are worn, this will cause the lever to not depress the switch in the side of the switch housing facing the front brake lever. Your front brake switch may be broken. Odds are that the front brake switch is the one causing the problem.
have you changed the flasher relay to run led indicators if not you will need to you cant run standard bulb indicators and led together. and with the brake like sounds like pulling on the cable when on lock causing switch to stay on check that location of the wiring is correct and sufficient freeplay
Gap your plugs to 38 thou. Check all your bulbs (one burned out will affect the rest) Take a look at all your fuses and make sure they are all ok. Otherwise you are probably looking at a wiring short which will require trouble shooting of the elctrical system. Buy your self a service manual for your bike, this will help you a lot.