Head Lights problem

[misty]

Have a problem with the head lights ,both the bulbs are ok
When i put on the side lights they are great
When i put on the dips they are great
BUT when i put on the head lights the lights go back to side the head lights do not come on

could the prob be the relay any help please would be great
many thanks

[MarkB]

Well I'm a complete cock when it comes to wiring but my camper suffered a similar problem, I changed bulbs I faffed about with regulators and it turned out to be a dodgy earth connection...doh!

[deezee]

I had a dodgy earth on mine, caused the indicator to come on when the headlight went on and the main beam put the sidelights on (and one of the indicators?).

[misty]

but if the dips are coming on would it not be the same for the headlights ?

[MarkB]

Originally Posted by misty

but if the dips are coming on would it not be the same for the headlights ?

Nope, my dip lights worked fine but when put on mains the indicators came on and stayed on and the ticker box sounded like it was going to have a "go bang moment"..It was a dodgy earth wire but took me hours to find it.

[misty]

ok i will search and find it
many thanks

[davedew]

Have you checked the fuses for the main beam power?

Sounds obvious but you never know.

[misty]

still cant find it checked the fuses what about the relay would that cause it?

[will_08]

Do you get what you should on the relay associated with the headlights. I.e Volts to pull the coil in. Volts in/out of the contacts?

[baz-r]

i take it you mean high beam goes out?
first things first take both bulbs out and set up high beam to be on
what voltage you got from ground (earth) and feed (positive)
if you got zero im thinking relay not working or not wired up right
if you have some voltage put the bulbs back in the circuit and check for voltage drop as there could be resistence some where