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if you have an old light bulb & holder off a car you could use it as a test bulb by inserting one wire into the earth pin and the other in each terminal when its turned on, if you get a light then its working.

personally I use a multimeter.

I think the only thing you might need to watch is the fact that if this is a new caravan you're about to tow, then there might be a minor mis-match if the towcar electrics are 'old', if you know what I mean.

I'm pretty sure that there was a slight change in the allocation of pins a few years ago.  Someone more knowledgeable might be of more help!!

This should be of some help http://www.volvoclub.org.uk/towbar_electrics.shtml

atb

Wizard

hi buy a cheap lighting board for a trailer,about £11.this will have all the indicators and stop lights and side lights.some have fog,some have reverse.any car factors should have these ie.motormania / halfords also www.ukcampsite.co.uk/redirect.asp?redir=http://www.towsure.com