Con­trary to reg­u­la­tion

Practical Sportsbikes (UK) - - Fettling -

I’ve had a 1997 Honda Fire­blade since new, but I have a prob­lem with the bike not charg­ing. I re­placed the bat­tery, al­ter­na­tor and rec­ti­fier, but the prob­lem re­mains.

I checked the volt­age across the bat­tery: at idle it’s 13.5V and at 5000rpm it’s 18.1V. With the lights on at idle it show 12.1V and at 5000rpm it’s 12.3V. Is the rec­ti­fier at fault or should I be look­ing more closely at the light­ing cir­cuit?

Steve Jones, email

Fer­ret says: The reg­u­la­tor is fail­ing to do its job when the lights are off and this is prob­a­bly down to bad con­nec­tions and/or a poor earth. You’re into ECU fry­ing ter­ri­tory here. The sys­tem’s be­hav­iour with the lights on is odd but again I’m sus­pect­ing the is­sues to be in­ter­re­lated. Sort earths, al­ter­na­tor, reg/ rec and bat­tery con­nec­tions and see what you get.

’Blade might have dodgy con­nec­tions

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