Electrical Issue-need some help
Long explanation so hopefully all info is here. 1995 GL1500 SE, Lehman conversion, unknown vintage/model, ~110,000 miles. Recently had some issues with an after-market alarm, since removed, that resulted in having to rebuild the CompuFire alternator & replace the battery with a Yuasa which is now ~1 year old. Issue first surfaced after this work was done. Then the "kill switch" failed & was replaced. All work done by a dealer I have used for years & trust. The Issue: Had to jump start the bike after sitting for a few weeks. Rode the bike ~ 130 miles. Had lunch.
Bike started & went home, ~150 miles. Next day the bike would not start. Noticed the radio was on, so I turned it off. Charged the battery & rode ~ 50 miles. Checked the voltage four days running & had 12.5 volts each time. Two days later bike would not start. Observed that the radio was on again. Must have turned it on while cleaning. Jump started bike & left on a weekend trip with some out of town guests.
Rode ~ 350 miles with a stop for lunch, no issues. Had the radio on all this time as GPS instructions play thru it. Next morning, no start. Jumped bike & rode ~ 300 miles with a lunch stop. The radio was off for this trip as I did not need GPS. Bike started next two mornings w/o issue, radio off the entire time. So, is it possible that the radio is somehow draining the battery when it is left on? Any other thoughts as to what might cause this?
If the radio is/could be the problem, any ideas about troubleshooting? All donations gratefully accepted. :) Stan