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Join Date: Nov 2007
Location: Chandler, Arizona
Unfortunately, one of the Vulcan 750s many features is a complicated headlight system. It has the reserve lighting system, which automatically switches filaments if one burns out, and activates a light on the instrument panel. It also has a relay that won't let the light come on until the engine fires. You will just have to take a multimeter and start tracing things down. If I had problems with the lighting system, I would scrap it, eliminate both the reserve lighting unit and the relay that prevents the light from coming on until the engine fires, and install a manual switch so I could turn the headlight off while starting. At least it is electrical, and not electronic, so some time with a multimeter should find the problem. I personally believe all motorcycles should have an "off" switch for the lights anyway. I see "always on" headlights the same way I see sidestand and clutch switches, just more unneeded government mandated safety bullcrap.
Oh, and BTW, even though you have a nice new sealed battery, you did do some damage to it by letting it go completely dead. It will no longer have the capacity it had to begin with, and the more times you let it go dead, the worse it will get. I have had the life of many bike batteries shortened by allowing them to go dead, so I finally gave in and got a Battery Tender Jr. for every one of my bike batteries. Jerry.
I am a motorcyclist, NOT a biker.
1997 Vulcan 750, purchased about a week ago
2006 Sportster 1200 Low
2013 Royal Enfield Bullet 500, converted to carb
2001 Yamaha XT225, heavily modified
2004 Honda Rebel 250
1979 Vespa P200E
2002 Vulcan 750 parts bike
1994 Yamaha XT225 parts bike