MrWorf
Member
Really useful Mojo247 Thank you.
When I've got the starting problem fixed (another thread), I'll investigate further.
Thanks for going to the trouble of attaching this info - Great.
MrWorf
Member
Doriz, my new stalk arrived by post. This weekend's gonna be busy - Thanks again.
MrWorf
Member
New main beam / indicator stalk installed today - but still no lights (side / dipped / tail).
Main beam flash works ok.
My question is if I describe the following tests carried out at the switch - does this look like I have Short ?
Live feed to switch (brown) constant live (but strangely registering 10.5 volts).
Switch the switch to side lights position, and brown live wire drops to 0 volts.
The Red side light wire also shows 0 volts when the switch is on.
A continuity test between red wire (side lights) and earth shows 0 resistance with switch off
A continuity test between blue wire (dipped) and earth shows full resistance (no continuity)
Switch the switch on to side lights and a continuity test between brown permanent live and earth shows 0 resistance.
Switch the switch to dipped and the same test on blue wire shows no resistance.
A lot to digest - sorry, but I'm thinking it might mean I have a short on the side light circuit ??
Open to suggestions, but also if I'm right, is there a place to look first - is it a common fault ?
Thank you in advance (again)
Main beam flash works ok.
My question is if I describe the following tests carried out at the switch - does this look like I have Short ?
Live feed to switch (brown) constant live (but strangely registering 10.5 volts).
Switch the switch to side lights position, and brown live wire drops to 0 volts.
The Red side light wire also shows 0 volts when the switch is on.
A continuity test between red wire (side lights) and earth shows 0 resistance with switch off
A continuity test between blue wire (dipped) and earth shows full resistance (no continuity)
Switch the switch on to side lights and a continuity test between brown permanent live and earth shows 0 resistance.
Switch the switch to dipped and the same test on blue wire shows no resistance.
A lot to digest - sorry, but I'm thinking it might mean I have a short on the side light circuit ??
Open to suggestions, but also if I'm right, is there a place to look first - is it a common fault ?
Thank you in advance (again)
mick 1986
Well-Known Member
The 10.5V isn’t really that strange. When you use your test leads on your meter, your basically finding the voltage “difference” between the two probes. So if you used an earth wire/point, and it’s not that great an earth, 10.5V would be “normal”. Where did you have the black probe when testing?
Next observation, you can’t test resistance with power turned on. It doesn’t work. You need to remove at least one battery terminal to do a proper resistance test.
mick 1986
Well-Known Member
That’s not a particularly good earth point. You would be better off adding a length of wire to the black probe, and going direct to the battery terminal.
Personally when I do resistance based fault finding, I will remove the positive battery terminal, and put a crocodile clip on the earth terminal. It’s the easiest way of ensuring you are on the best possible earth. When doing test, try and quote numbers too, as what one person sees as an “open circuit”, might not be, same can be said for a “short circuit”.
MrWorf
Member
Hi Mojo247, Yes I've replaced the main switch and the indicator stalk with brand new after market parts.
I have a dim dip relay on order now after reading other owners accounts of the same problem.
I was out in it today and mysteriously while repeatedly trying the lights, they eventually came on !
May be something to do with temperature in the cab ??? I had the blowers on.
Also when I got home, I was trying various switch combinations to see if it all worked, and when I tried main beam, there was a funny buzzing momentarily from behind the clocks.
More evidence I hope - it's the dim dip relay ? I'll guarantee they wont work again tomorrow
I'd welcome all suggestions. As proven with my starting problem thread, this forum has proven really valuable !
Thank you.
I have a dim dip relay on order now after reading other owners accounts of the same problem.
I was out in it today and mysteriously while repeatedly trying the lights, they eventually came on !
May be something to do with temperature in the cab ??? I had the blowers on.
Also when I got home, I was trying various switch combinations to see if it all worked, and when I tried main beam, there was a funny buzzing momentarily from behind the clocks.
More evidence I hope - it's the dim dip relay ? I'll guarantee they wont work again tomorrow
I'd welcome all suggestions. As proven with my starting problem thread, this forum has proven really valuable !
Thank you.
MrWorf
Member
I've now replaced the dim/dip relay and there is no change. No lights at all.
The key to this must lie in the fact that with the light switch off I read about 10 volts at the live feed to the switch.
When the switch is on it reads zero volts.
By my reckoning you only get 0 volts if both probes are on the earth side of the circuit so does this mean a short somewhere ?
The key to this must lie in the fact that with the light switch off I read about 10 volts at the live feed to the switch.
When the switch is on it reads zero volts.
By my reckoning you only get 0 volts if both probes are on the earth side of the circuit so does this mean a short somewhere ?
