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I have a 2012. Bought it a few weeks ago, the original seller said it had a bad fuel pump, but I heard the fuel pump prime. A mechanic told me he thinks it's the main 30 amp fuse and the battery. Lights stopped working horn was really low and when I'd try to start it, thx whole dash would die. I Replaced both the battery and main 30 amp fuse. Now when I try to start the bike, I hear a single click coming from the main 30 amp fuse or at least in that area. Just clicks one time but still won't start. Any ideas on what the problem is?
 

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Hi sfolksss and welcome to the forum.
I've had the same issue once but that was an almost dead battery. Have you checked the voltage on your current battery? Does your bike have any electric modifications? Maybe there is something wrong with your electric system that drains your battery even if you don't use it.
 

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That sounds suspiciously like a bad starter relay, to me; but I have never had a cbr250r.
 

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Get a volt meter and check the voltage. It should be over 12.7V.

Even a new battery may require charging before use.

Chances are it does.

 

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I have a 2012. Bought it a few weeks ago, the original seller said it had a bad fuel pump, but I heard the fuel pump prime. A mechanic told me he thinks it's the main 30 amp fuse and the battery. Lights stopped working horn was really low and when I'd try to start it, thx whole dash would die. I Replaced both the battery and main 30 amp fuse. Now when I try to start the bike, I hear a single click coming from the main 30 amp fuse or at least in that area. Just clicks one time but still won't start. Any ideas on what the problem is?
Need to check spark plug cap hope current is not leaking from a worn out spark plug cap insulation
 

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Need to check spark plug cap hope current is not leaking from a worn out spark plug cap insulation
It would still crank over, regardless as to whether the spark plug cap is arching or not.

Check all ground connections, disconnect and clean them then reconnect, clean battery cables, and check for voltage drops between the battery and starter. Ensure the battery is good and fully charged before trying to start.

If it still won't crank over but clicks, you can attempt to replace/jostle the starter relay/solenoid.
 
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I Never seen Any CBR 250R with One Click start,
Maybe All CBR s took 2 to 3 seconds to starts...
He means the starter doesn't turn the engine over and there is just a single click sound which happens when the battery is low on power. The almost dead horn and dying lights also indicate that there's not enough juice.
 

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So I thought I'd give an update. The battery worked just fine actually. In fact I tried a few different ones. Sellers battery he said it was brand new and a few I bought. Same thing happening. It's a click coming from the main 30 starter relay. Tried replacing that still having the same problem. So.i thought maybe the starter and of course same problem. Seller and sellers mechanic thought it was the fuel pump. I got the sellers mechanic to come look at it but we actually heard it prime, so he told me battery and main relay( I paid him for the parts and he stole my freaking money) ordered the new relay from Amazon another mechanic told me it's probably I just got a cheap knockoff, so I ordered another one that had been taken off the same bike. Same exact problem. Now I'm thinking maybe alternator.
 

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So I thought I'd give an update. The battery worked just fine actually. In fact I tried a few different ones. Sellers battery he said it was brand new and a few I bought. Same thing happening. It's a click coming from the main 30 starter relay. Tried replacing that still having the same problem. So.i thought maybe the starter and of course same problem. Seller and sellers mechanic thought it was the fuel pump. I got the sellers mechanic to come look at it but we actually heard it prime, so he told me battery and main relay( I paid him for the parts and he stole my freaking money) ordered the new relay from Amazon another mechanic told me it's probably I just got a cheap knockoff, so I ordered another one that had been taken off the same bike. Same exact problem. Now I'm thinking maybe alternator.
OK, a few things don't make sense here.

If it won't crank, the fuel pump can't be the problem.

Have you checked all the fuses? Look closely.

You need to start checking voltage. Battery voltage at the terminals first, then voltage at the terminal of the relay. That will tell you if you are losing voltage before it gets to the relay. Then the output side of the relay, which will tell you if the relay is bad. Then the hot terminal on the starter. You should get close to full voltage (12.7V is full voltage) everywhere along the line. If you are getting full voltage to the starter and it doesn't turn over, most likely it's the starter.

Have you tried spinning the engine over by hand or push-starting to confirm it spins freely?

The alternator only charges the battery, so if you have a fully charged battery (12.7V or more) the alternator isn't the problem.

Concentrate on tracing the voltage to the starter. That's most likely the issue.

If I had to guess, I'd say battery (I know you switched them), battery connections/grounds, damaged wires, starter relay (i know...), or starter motor.
 
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