Hi guys.
I searched but got no conclusive solution.
Please advise.

I parked the bike outside for 2 weeks under a flimsy cover. Its winter now, dry and no rain, ice or snow. Just well cold at night (3 deg). The bike worked perfectly. 2 weeks later and I want to start bike but NO electrics, no lights, no dash, no red led flashing, no socket power, no indicator, no clicking. DEAD. NOTHING. So I charged the battery overnight but nothing. I then (sort of) jumped the battery with a 12V spare car battery. The jumper cables were dodgy and old. But there was life! The lights, dash, circuit test and neutral all came on. Great!

So I pressed the starter button with the car battery still jumped to the bike battery and EVERYTHING went dead immediately. DEAD. I heard a sort of click disturbance like when the battery isnt connect properly. But I checked and rechecked all the connections and fuses. All seems ok. Now I dont know where to check anymore. I never have problems with bike. 😣

Can anyone guide what to do/check/test from here? Did I damage something in the jump? Is it ECU??? Rectifier? Should I have let the battery charge more bwfore I pressed starter button?

Ill appreciate any wisdom.

Thanks

If I understand you correctly the bike has been left in sub zero temperatures,outside. When charged it lights up the display etc BUT has not got enough amperage to start it.
Connect it to a car battery and still nothing..

How old is the battery?..it may take a charge BUT not have enough amps to be able to turn the engine over..

Hi Nikroc

It was left outside but not subzero temp but 3-6 deg Celsius on the coldest nights.

The battery is about 6 years old. Never gave me any problems. On its own nothing switched on. No dash, lights or anything. As if no battery at all.

When I connected bike to car battery everything switched on. But when I pressed start button to turn the engine, everything shut dead as if no battery at all. No battery does anything to bike now. Completely dead and stays dead with both batteries.

personally id recheck aii the fuses,maybe even replace them...as for the battery....at 6 years old,and �50 id consider replacing it...

I certainly hope it is just the battery and nothing more serious. I really cant afford a $500 problem right now. Someone is coming to check the bike tomorrow. Nervy wait...

Someone as in a mechanic?..knowledgable friend?..