Bike only starts when charger is plugged in.

[SARider]

My bike won't start unless if the charger is plugged in. I thought it might be the battery so I bought a new one, but that didn't help.

I have absolutely no idea what could be happening. Any help is appreciated.

I have a 2007 gz250.

[alantf]

Did you charge the new battery, before fitting it? Have you done any voltage tests on old battery? We need more details, voltage readings etc., otherwise we're only guessing. With details we can look at what steps you need to take next.

[alantf]

Forgot to add - You didn't use a high powered car charger to start the bike, did you? If you did, you stand a good chance of frying the bike battery. 0.6A is good for a bike battery, and certainly no more than 2A for a short time.

[jonathan180iq]

Alan is out electrical guy - listen to him.

[grasshopper]

just an example....I had the same problem when I got my gz250. while it was running I checked the voltage across the battery at idle, then checked it while increasing the rpms to make sure the voltage was increasing with the rpms to make sure the bike's electrical system is charging correctly. the charging system was working correctly so I replace the battery. now it cranks right up every time. definitely listen to alantf and jonathan180iq's advice.

[SARider]

I have no tools to to test voltage (I don't understand electrical), but I'm sure I can borrow one soon. I took both batteries to be tested, and I don't know the numbers but they said they were fine and had more than enough to crank a bike. They mentioned the old battery actually had double the necessary cranking power. The old battery was first plugged into a trickle charger and it would not start the bike. After, I did try the car charger which is what turned it on. This was before I had the batteries tested.

I read online that some part of the bike may be faulty requiring more than the usual power to start. Not sure if there's any validity to this.

[grasshopper]

which part? ignition coil?

[alantf]

You'll need to get a little multimeter (voltage, resistance, etc) to do the tests. They're really cheap (Just a few dollars, made in China :tup:) Probably better than borrowing one, and then you've got it for future battery tests etc, once you get the bike running.

[Water Warrior 2]

Gotta agree with Alantf. A cheap $10 meter is worth it's weight in gold when trouble shooting. Wally World should have one. My 1st meter lasted 30 years or more before I accidently killed it. A new digital replacement is even better than the old one with a needle and scales.

[grasshopper]

the right equipment will help you get the job done. there are post on here that show you how to test these voltages. alantf has a lot of them.

[Water Warrior 2]

Alan is out electrical guy - listen to him.

Electricity is an invisible force known by it's effects. I sometimes think professionals like Alantf can actually see it. :tup:

[Cathy]

Qasual - Possibly a bad ground.

[SARider]

I asked my friend who tested my bike before. He stated before turning on the voltage was at 12 something, and while you're cranking it goes down to 11. Haven't had a chance to go and buy my own, daughters been sick so I'm o baby duty.

How would I test for a bad ground?

[grasshopper]

did you say if you had the bike manual? if not there is a post with it. you can view and research the electrical system. if you live close to me I could check it out for you. the first place I would start is by getting the volt meter so we can check the charging system.( the example I posted earlier)

[raul10141964]

check the voltage at the coil when cranking, nead 10+volts to start