C90 MOT Fail

[benjobanjo]

Just got back from the MOT on the C90 - it failed on the electrics. Everything works, but when the indicators are going and the lights are on the front and rear light surges.

The fella was fair and said he'd accept a dim, but the output was being halved and couldn't pass it on that.

Gutted. I'm thinking it's maybe a dodgy earth on the bike? Does anyone have any other suggestions or experiences of stuff like this?

[LuS1fer]

The lights work from the generator so will dim when other electrics are used. However, how old is the battery as this could have an effect, it's only 6v and very small.
Other than that, check all your earth wiring and bulb sockets and even bulbs if the contacts are worn.

[Biker's Nemesis]

LuS1fer said:

The lights work from the generator so will dim when other electrics are used. However, how old is the battery as this could have an effect, it's only 6v and very small.
Other than that, check all your earth wiring and bulb sockets and even bulbs if the contacts are worn.

Thats pretty much your answer there. ^^^^

I also have a bike with 6v electrics.

[benjobanjo]

It has new bulbs and a new 12v battery. Yeah, I'll check the earths today and see what's going on. Such an infuriating fail

[benjobanjo]

P.s. thank you for the advice

[Biker's Nemesis]

benjobanjo said:

It has new bulbs and a new 12v battery. Yeah, I'll check the earths today and see what's going on. Such an infuriating fail

12v, is that a typo?

[benjobanjo]

Biker's Nemesis said:

12v, is that a typo?

The C90G is 12v. I think it was earlier models that were 6v

[orangefzr]

I have had the same problem as this with a car and the fault was with a brand new faulty bulb, But that fault could be any of the previous comments as well

[Rubin215]

They all do that sir.

Tester should have picked the revs up to see if the increased power output cured it, if it does it's a pass.

[bimsb6]

Check the wattage for the bulbs is correct and all the same .

[Krikkit]

If nothing else, could you fit LED bulbs/indicators/tail lights instead? They hardly take any power.

[Fluid]

bimsb6 said:

Check the wattage for the bulbs is correct and all the same .

This was the problem with my Vespa. 6v system but, the previous owner had fitted 12v bulbs. A few quid spent on eBay, problem solved.