Question about 1984 Honda VF 1100 Sabre

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I have an electrical problem and need some help. The other day I was riding and I flipped the headlight switch to high beam, the engine began to miss and then it completly shut down, we used jumper cables to get it going again but it ran a little rough to my house. I checked the voltage on the stater and it was good. something is draining the battery, I started it today (didn't ride it) and switched between the high and low beam switch, and it didn't affect anything. had to use the charger on it to get it started though, Any ideas, thanks Jim

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Yes, I suggest that you are not charging properly. the headlight to high beam killing in one instance and no effect later is the big clue. You were riding along, slowly loosing state of charge, and it was not apparent, then place heavier load, and the system does not have the voltage to run the rough, etc.
So, where are you? You need to independantly slow charge the battery. check water, and connection quality. this charge, on a home charger needs to be like 2 days or so...if it boils, get another battery or be mislead in other tests. batterys that boil do not make it, ultimately, and leave you stranded.
Then put the battery back in the bike, hook everything up, start up and at 1500 to 2000, measure voltage at the battery. Needs to be 13.8 to 14.2 or pretty close to that.

Bikes tend to overcharge batterys. This boils out the water, and cells goe dry and that kills battery, just replace it.

A common issue with bikes is the DIODE PACK, to make an alternator work DC on 12 volt systems, diodes are required. They are one way valves for electricity, and fail often. Then you have a leak to ground and the battery goes dead, as well you do not charge correctly, same leak.

Easy to change, measured with a scope, (yeah sure) or ohm meter. Continuity test, go one way no go the other. Any open, or connect in both measurements is failed.

My bet, diodes...And get a Harley. Just kidding, but you do get to know all of this stuff with a Harley, cause they always break...

Posted on Sep 27, 2010


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