Took the bike out a run. I’d made sure the lights and indicators worked before setting out on the journey. Neutral light lit up in green when in neutral as it should.
Halfway into the journey I noticed the battery light was on in the binnacle. I then noticed headlamp and rear lamp were off and wouldn’t come on with using the switch through all it’s positions.
Upon further inspection…
1: Indicators work.
2: Neutral light won’t come on green.
3: Battery light is on except when selecting neutral. Select first, 2nd etc and battery light will come back on.
4: Bike will start and run.
5: 4 fuses are good.
Any advice on where to look first would be appreciated. Thanks.
It could be a bad earth to the lighting circuit. Check also all the spades to the fuse box and clean them with fine wet and dry. Check and clean all earth wires.
Not sure why the generator light would be connected to the neutral light though unless there is a short between the two wires below the warning lights.
Best of luck Chris
PS I can supply an A3 colour wiring diagram for your bike click here
Recheck the fuses. Those continental type are known to fail ‘invisibly’ with one of two reasons:
There is a layer of corrosion on the end caps which is preventing proper contact with the fusebox terminals. Use a piece of fine wet’n’dry (400 grade or higher) to clean the caps and the terminals. Don’t forget to clean inside the holes on the fusebox terminals
Vibration and/or rotating the fuses to get them working again has caused the fusebox terminals to cut through the end cap of one or more fuses and there’s no contact between the fuse and the terminal. It sounds impossible but I’ve seen it multiple times on both big-block and small-block engines where the remains of the fuse end cap is held on by sharp edges digging into the fuse body.
My preference is to lob the original fusebox and replace it with a blade-fuse type.
Chris, I purchased your wiring diagram previously and it’s great.
So I had checked fuses with multi-meter, but, as you said DaiG, best to recheck, clean with fine wet-n-dry, a bit of dielectric grease for good measure and we’re back in business.
I can remember once riding into Abergavenny on the B4598 from Usk, got to the big roundabout there and the indicators suddenly stopped working. Found a stopping place to investigate and the fuses just needed a ‘twiddle’.
Added that to my main reply. I should have remembered cutting the end cap completely off a white fuse on my G5 when giving it a twiddle to get it working again. One too many twiddles…
I would agree with Chris’s comment about an earth fault. Electrons can be very clever and find all sort of unexpected ways to complete a circuit if their usual route is cut off by a broken earth wire.
If you have the big rubber dash like Spada and LM2, with the clock and Voltmeter, try not having its earth connected. The most bizarre behaviour happens with the dash lights.
Thanks for the input guys. Just to be clear, a twiddle of the fuses fixed the issue. I then used wet and dry paper to clean off any corrosion and used di-electric grease when refitting the fuses.
