huzzer 0 Posted December 29, 2006 Ive got 12v coming to the bulb plug for the reverse lamp, but it wont light the bulb! Ive checked the bulb and it works and checked the voltage. I'm no expert in electrics so i'm stumped. Does it need wattage? how do i check this and what could the problem be if i dont have any but have got voltage. Very confused! Share this post Link to post Share on other sites
easypug 0 Posted December 29, 2006 You need a + and a -, i'm not sure where the earth is for the reverse lamp. I would imagine you've not got or have a bad earth to the lamp. Share this post Link to post Share on other sites
scumbag 0 Posted December 29, 2006 Are you using a mutlimeter for this? If you have a probe in + and - and the volatge is travelling across then shouldnt be a problem with that, but as easypug says worth checking the earthing point. Dont know if you hve tried this, but it maybe the bulb holder in the light is corroded as the +ive is the bit at bottom of the bulb and the round base usually the neg. Share this post Link to post Share on other sites
huzzer 0 Posted December 29, 2006 Thanks guys. If it was a bad earth I would have assumed that I would get either intermittent reading or no voltage supply at all? although I could be wrong! I am getting a good solid 12v right to the bulb (all connections are fine and I have tested at connector and further back up the circuit)? Share this post Link to post Share on other sites
Ahl 4 Posted December 29, 2006 I had the same thing before. It was getting the voltage but the contact wasn't quite touching the side of the bulb. Share this post Link to post Share on other sites
gizzmo 3 1 Cars Posted December 29, 2006 sounds like the point of contact spray a little wd40 in. with all extra low volage circuits contact has to be firm or resistance gives volt drop across the appliance (bulb) Share this post Link to post Share on other sites
huzzer 0 Posted December 29, 2006 Thanks guys. Will give that a go. Share this post Link to post Share on other sites
Guest srack Posted December 30, 2006 p = u*i if you have 12v (u) check for your amp (i) rear lights request 21w (p) so you need to get 1.75amp down there (based on resist of 6.857) take a multimeter to check if you have it if you do, your problem is within the bulb's house replace it. cheers. and happy new year. Share this post Link to post Share on other sites
Anthony 1,003 Posted December 30, 2006 Just clean up the contacts and give everything a wiggle (technical term that ) - the rear fog and reverse lamps seem to suffer badly with crappy connections, normally deciding to stop working on the day of your MOT in my experience *sigh* Share this post Link to post Share on other sites
