Topic: 76 CB550F Key-on overdraw

[Kickinwing97]

Hello fellow CB owners! I just got this Cb550f last week. I’m very surprised about the amount of ppl that love and continue to tinker with these bikes!
I’ve had a few issues so far, the bike has an M Unit Blue and it had a dead Regulator/rectifier when I bought it. I thought good to go, WRONG! The previous owner over filled the oil, puking it all over the back half of the bike. I sprayed engine degreaser and washed all the oil off. But now I have an electrical issue.
With the Key- ON, the bike draws enough power to drain the battery within 5 minutes. The light for the left gauge also died but I believe it unrelated.
Any help would be greatly appreciated! Thanks mates!

[calj737]

Probably the previous owner installed a WAY TOO SMALL battery given the “customization” they’ve done to that bike.

A bit more detailed pictures and information on the actaual battery installed is helpful. Also, how did you determine the R/R was “dead”? If that is true, it would have killed the battery so at least replacing the R/R with a quality unit and battery may sort out your problems.