Have a 1966 Bonneville, my headlight blew out,so i went to the local motorcycle store and bought a new headlight, after i installed it the entire system lapses in the electrics why? what causes this issue?
SOURCE: 1993 harley sportster 1200 headlight quit working
could be a bad ground in the head light bucket or the jumper from frame to the triple tree
SOURCE: 2006 Bonneville America electrical failure
To start with, your battery was probably already low. You have to be at about 4000 rpm for the charging system to kick in and put out 14v or so. So if you just sit and idle, you will eventually run the battery down. If it is already low, you may have run it down below where there are enough amps to start it again. I know my 2002 BA started having what appears to be charging or regulating problems and the batteries won't stay charged. Try charging the battery with a good trickle charger to begin with. Then, when it is fully charged, run the bike and see if the charging system is keeping things up.
Mike
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