There have been reports of both headlights going out while riding, or not coming on when the ignition is switched on. This can be caused by several things, including fuse failure, a poor wiring connection, or dirty dimmer switch contacts. But the starter switch is also a frequent cause of this problem.
When you hit the start button, you notice that the headlights are temporarily switched off. This reduces the load on the battery, so the engine will crank over faster.
There are two sets of contacts in the starter switch. One set makes contact when the button is pushed, to activate the starter motor. The other set breaks contact when the button is pushed. This set is what turns off the headlights.
The second set may need cleaning. You may try spraying some contact cleaner into the starter switch. If that isn't effective, you will have to disassemble the switch to clean the contacts. Put a little dielectric or silicone grease in the switch to retard corrosion.
Now, if your problem is a delay in switching between low beam and high beam, the dimmer switch likely needs service. Be careful not to lose the spring-loaded detent ball if you disassemble the switch. It wouldn't hurt to clean all the connections at the headlight relays and coat them with dielectric grease, too.
Last updated on January 27, 2014 © 2001-2014 M. E. Martin, All rights reserved