JST Posted November 3, 2014 Share Posted November 3, 2014 Morning all, Just after a little help. C reg 90 with autobox and later td5 style bulb one piece holders. rev light does not work. i have 11.5v (engine not running) at bulb holder but bulb doesnt light. (std rev light bulb). done the normal - changed bulbs, checked the bulb holder etc (cont through it with bulb fitted) wiring to the autobox rev selector is all good. i am assuming the feed although showing nearly 12v cant carry the load. Where does it pick the 12v feed up from? behind one of the rear light clusters? What colour is the wiring for the rev light switch (green and green and brown?) i am assuming the gbox switch just makes a circuit for the 12v feed, with the feed coming from the rear light clusters? more then likely a bad earth i thought but i have tried it with different earth points/wires to the bulb - still nothing. if i fit a 9-24V led it will glow 'a tiny bit'! any help greatly appreciated. Quote Link to comment Share on other sites More sharing options...
mmgemini Posted November 3, 2014 Share Posted November 3, 2014 Throw that meter away and use a test lamp. The problem with the meter is that it will read 11.5 volts if only one strand of the wire is connected. What voltage do you have at the switch ? How good are the connections at the switch ? The switch is fed by a green wire. Possibly connected to the diff warning light. As you day green with a brown trace for the wire Quote Link to comment Share on other sites More sharing options...
miketomcat Posted November 3, 2014 Share Posted November 3, 2014 If you have a higher voltage at the battery then check all the connections including earths 11.5v is low so unless your battery is knackered you have a connection or brocken wire problem. The fact you have any voltage suggests the switch is working fine iirc 12v goes to the switch then to the lamp. Mike Quote Link to comment Share on other sites More sharing options...
JST Posted November 3, 2014 Author Share Posted November 3, 2014 If you have a higher voltage at the battery then check all the connections including earths 11.5v is low so unless your battery is knackered you have a connection or brocken wire problem. The fact you have any voltage suggests the switch is working fine iirc 12v goes to the switch then to the lamp. Mike the switch is def working, as suggested. Not sure on voltage at switch - will need to check, connections are all good. anyone know where the feed comes from prior to the switch? Quote Link to comment Share on other sites More sharing options...
cackshifter Posted November 4, 2014 Share Posted November 4, 2014 I had similar problem,on mine it was one of the connectors on the bulkhead just below the clutch m/cl, a bit of a wiggle and it worked, so some serious spraying with contact cleaner after that, fine since. Quote Link to comment Share on other sites More sharing options...
western Posted November 4, 2014 Share Posted November 4, 2014 plain green wire from fuse box ign switched 12v feed to reverse lights & various other items Quote Link to comment Share on other sites More sharing options...
JST Posted November 4, 2014 Author Share Posted November 4, 2014 thank you both, will check multi plugs and trace wire to fuses, thank you Quote Link to comment Share on other sites More sharing options...
western Posted November 4, 2014 Share Posted November 4, 2014 clean the glass fuse clips as well, sometimes these get tarnished & prevent current flow. Quote Link to comment Share on other sites More sharing options...
discomikey Posted November 4, 2014 Share Posted November 4, 2014 does your multimeter support amperage testing? it is ideal for these situations. and like mentioned above a test light can often be better than a multimeter. better still a power probe, one day ill get round to purchasing one Quote Link to comment Share on other sites More sharing options...
JST Posted November 5, 2014 Author Share Posted November 5, 2014 clean the glass fuse clips as well, sometimes these get tarnished & prevent current flow. already done, was the first port of call Quote Link to comment Share on other sites More sharing options...
JST Posted November 5, 2014 Author Share Posted November 5, 2014 does your multimeter support amperage testing? yes,, but i binned it....... where and how am i looking to check amperage? Quote Link to comment Share on other sites More sharing options...
discomikey Posted November 6, 2014 Share Posted November 6, 2014 you would put the multimeter in series with your lighting circuit, on the amperage setting, and it will measure how much its pulling, this will give you an idea of how much can actually get down the wire. ill see if I can find an instructional video Quote Link to comment Share on other sites More sharing options...
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