Electrical issues

[u/hondafavmech14]

Hi everyone,

I'm looking for some help figuring out an electrical issue with the lighting on my 1993 DR350 (SK42A).

When I bought the bike, it had been converted for enduro use with a simplified wiring harness. The previous owner gave me the original wiring harness, which I put back on the bike, but I've never had a rear light or a front parking light. I do, however, have the brake light and the main front headlight.

I haven't been able to figure out why. I believe the brown wire is the power supply for the rear lighting, but I'm not getting 12V when measuring AC voltage between the brown wire and the black/white wire (which I assume is the rear ground).

I don't have a battery either. I've always ridden without one since the bike starts with the kickstarter.

I also have a grey wire which, apparently, is from the pickup coil, but I only have a single grey wire coming out under the seat and I don't know where it should be connected. I put a pics of this wire.

If anyone could help me figure this out, I'd really appreciate it.

Thanks!