Advice: What’s causing Daytona 955i's electrical woes?

What’s causing Daytona 955i's electrical woes?

Q.My 1999 Triumph 955i Daytona is suffering from an increasing list of electrical faults. First the brake light stopped working, now the indicators have stopped and burnt out two flasher relay units. Today the horn has failed. There is a new battery, but that’s made no difference and I really need to track down the fault to get the bike through its MoT.
BigtonySW, MCN forums
A. If you’ve changed the battery recently, chances are that was because it had been getting too much voltage. In which case it is highly likely the regulator/rectifier is faulty and will burn out/bake that new battery. If you know how to use a multimeter, see how many volts you have with the engine stopped and then running at 4/5000rpm – it should be about 14.5 volts. There’s a very interesting thread on regulator/rectifiers at this link:

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