Electrical problem

[Jac-al]

hi, ive still got a charging prob. i checked the battery earlier and the maintenance free cap on top had popped out. is this a reg/rec problem? Also i forgot to mention i got an aftermarket LED tail light could this be drawing power and will i need a relay to sort it out? shot

[Morespeedvicar]

The led light should draw less power then the lamps! What voltages are you getting across the battery with bike not running and running with lights on/off? Sounds to me like its over charging so dont use your bike till you've tested it! otherwise you'll kill the electrics!
Cheers
Ian

[Jac-al]

bike off 12.71, bike on 14.3, lights on 13.02. ?

[bikemonkey]

Sounds about spot on to me.

Maintenance cap popping off may not even be anything to do with the charging system, could just have vibro-ed off.

[magg]

Load test the battery, high beam lights ON and engine OFF. Fully charged battery voltage should remain above 12 volts more min 15-20 minutes, if not then battery is suspect.

[Morespeedvicar]

Yeah thats not far off, 13 running with lights maybe a bit low. How olds the battery?

[Jac-al]

i got the battery in October

[Morespeedvicar]

Is the battery getting hot? Was the acid filled to the right level? Dunno wat else to sugest, maybe just one a them things.

[Jac-al]

Still having problems. Just tested the battery at 5000rpm and it was at 19.3volts but when i try start the bike it just buzzes. Im sure the low beam relay mod i did is causin this?? Maybe i didnt do it right

[speedy231278]

If it's really 19.3V at 5K, then the battery is being over charged, which can lead to very poor charging, going flat quickly and general nastiness. The usual culprit for this is the reg/rec having failed, and not regulating the output. Measure the battery at 5K with lights on and off to see if the mod you did is causing issues. I doubt it will be though. 15.5V is considered the safe max for charging before you start wrecking the battery.