Diagnosis please.

[pdsquire]

Transalp not started since August. Battery flat (7.4V) Jumped it off the Pan and left it running. After about 10 minutes it ran with the jump leads off. Voltage at tickover (everything off) from about 12 to 13.2 but averaging about 12.7V. BUT when I rev it the voltage drops. I went for a ride round the block and any drain (brake light, indicator) knocked the rev counter out but it came back when I let the engine idle.

So basically there's charge enough to charge at tickover but not when there is greater demand for the spark plugs.

Battery now at 11V so still pancake-flat. My theory is the bike will behave once the battery's healthier (or replaced). Am I right, or do I have a weak alternator or RR problem (which were not there in August)?

Thanks in anticipation...

Philip

[sean]

Yes replace battery and it will be fine

[pdsquire]

Thank Sean.

[Meesh]

Lol! This is not an uncommon thing obviously .... I was woefully disappointed yesterday too with flat battery issues after long storage.!!! I'm hoping for better luck by next weekend

[steveR]

Lol! This is not an uncommon thing obviously .... I was woefully disappointed yesterday too with flat battery issues after long storage.!!! I'm hoping for better luck by next weekend

Hopefully a trickle charge will sort the battery.

The HISS immobiliser drains the battery over a period of time and really needs kepping topped up. I buggered my TA battery last year as I stole the solar charger for using on an electric fencer!