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Old 02-16-2019, 12:12 PM   #1

Join Date: Apr 2015
Location: San Francisco
Motorcycles: CB250 2003
Diagnose this electric problem?

Hey Barfers!

Greetings from a Honda CB250 nighthawk newbie who has been much helped by these forums.

Here is my problem:

Bike runs fine but sometimes after parking there is no juice to the starter. If I roll and pop start it I can get it running no problem.

At first it seemed if I leave the turn signal on when I stop and then start it that was somehow draining the battery. Not so sure as I seem to have same problem even if I set the signal indicator to off when I start it.

Now I've noticed that the high beam indicator light is now flickering when the beam is high, this is new, I see this when the bike is running.

Battery is about 3 year's old. Bike is a 2003.

Should I buy a new battery or is this something different going on?

Also - possibly unrelated - when riding sometimes the bike will just stall. Starts back up usually, hasn't been recently, and began way before the electrical issue.

One last thing - the horn doesn't work and it's like the horn button is jammed. The whole assembly of the turn signal horn and high low is original and maybe that's what needs to be replaced?

Thanks for any help with this.

Last edited by TrueFeelings; 02-16-2019 at 12:14 PM..
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Old 02-16-2019, 01:46 PM   #2
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Join Date: Jul 2011
Location: East Bay
Motorcycles: '87 Paso 750. '07 KTM 990
Name: Chris
A few things to check:

1) Possibly the starter button contacts are worn - open it up and see
2) Check main connections at the battery - corroded/poor contact will mimic a lot of electrical problems
3) Battery condition: water level, standing charge. How often do you ride? An unmaintained battery could easily die within 3yrs.

Also: is the bike kept outside or garaged & dry?
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Old 02-16-2019, 01:55 PM   #3
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Join Date: May 2016
Location: Vacaville
Motorcycles: 2002 RC51 2007 CBR600RR sold1982 CB750F long term project?
Name: Steve
Start with the battery. Voltage should be 12.8 volts or higher. Shouldn't drop below 11V when you press starter. Have it load tested. Take care of horn/t/sig switch problem as it may be related. I always start with battery when diagnosing electrics. Have fun.
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Old 02-16-2019, 02:56 PM   #4
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Join Date: Nov 2006
Location: South Bay
Motorcycles: Honda ST1100 ABS (tweaked here and there)
The bike stalling is a clue. Besides checking all battery connections, take your kill switch apart and clean it. If contacts are corroded, that may be your problem. Intermittent contact inside the kill switch could kill the engine as well as make the bike a non-starter.

When you check battery voltage, only do so after it's been off the charger or the engine has been turned off a minimum of one hour. Then check voltage at the battery with the engine running at 3-4000 rpm.

Report back.
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Old 02-17-2019, 09:36 AM   #5
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Good hints. First rule. Don't throw shit at it, expecting it to thrive.
Second hint. Buy a cheap $15 multimeter and do the tests listed in the "charging" thread.
Third hint. If you think something might be the problem, eliminate it and see if it is. ( horn, turn signal.)

Until you get a meter and diagnose, you are wasting your time.
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