reverse light doin strange things

me doris aint made me a cuppa yet so my head aint werkin at the moment, but basically it wont werk,multimeter is showing i,ve got me 12 volts withit in gear ignition on at the bulb holder but bulb will not light up(bulbs good checked it)
with the engine running with reverse gear engaged(transfer box neutral)its showing 3 volts and obviously still wont light up
so basically anyone got any ideas?it was working fine till the other day when i removed the lense to change the bulb and found the live terminal touching the earth cooked the switch? goosed wiring? i,ll probably figure it later but any ideas for now mite help me get my head round it and think a bit better

If you have 12v at the bulb holder are you sure you have a good earth for the bulb, it could also be that you are getting 12v but there is a bad connection and it is not able to pull enough current to light the filament.

When the engine is on you only have 3v? Hmm does sound like a bad connection.

yeah , either a bad connection at either end or a bad earth, if the live to the bulb holder is corroded it will give yer a bad reading , as will bad earthing, does some weird things bad earths !

Whats the chance that you've fitted a twin contact bulb or a twin filament bulb in a 21w single filament holder dripsybabes?

ratty said:

Whats the chance that you've fitted a twin contact bulb or a twin filament bulb in a 21w single filament holder dripsybabes?

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fekall tis all new light an bulb

it can wait till i can be arsed ta look see

oil dripper said:

fekall tis all new light an bulb

it can wait till i can be arsed ta look see

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If it's all correct and the voltage is getting to it ok then I rekon you should check the contacts. Probably find one of em aint touching the bulb.

checked the unit,seein as its a ****part one,surprisingly it werks wen put across a battery