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Reversing light switch

17 Jun 2009, 7:49am
I wired up the reversing switch last night, and stuck the multimeter across the terminals.

I think it may be duff, because I don't get continuity when the gearbox is in reverse. I see the meter drop to about 0.20, and then it starts very slowly to drop to about 0.15, and stay there.

Is this normal? I can't believe it is - a switch is either open or closed...

I guess the switch may be gummed up from laying idle for so long - although some taps with a spanner hasn't made any difference. I can't see a way of adjusting it either.
17 Jun 2009, 7:57am
GreatOldOne wrote:
I wired up the reversing switch last night, and stuck the multimeter across the terminals.

I think it may be duff, because I don't get continuity when the gearbox is in reverse. I see the meter drop to about 0.20, and then it starts very slowly to drop to about 0.15, and stay there.

Is this normal? I can't believe it is - a switch is either open or closed...

I guess the switch may be gummed up from laying idle for so long - although some taps with a spanner hasn't made any difference. I can't see a way of adjusting it either.


Multimeter's can often be misleading - especially the modern digital type as they use a very low wetting current. I would try a bulb and battery test first before you start thinking about replacing it.

Robin
17 Jun 2009, 8:00am
Thanks Robin - I'll hold off popping down to the parts desk for now.
18 Jun 2009, 2:27pm
Good job I didn't buy a new switch - old one was fine. Tried it with a PP3 and my old school continuity probe and it lit up fine. :)