Has it got volvo electrics or after market and is it 2 7pins (grey and black sockets) or 13pin,
If its 13 then any MOT station should have a tester to check towbar electrics,
Also depending on age of caravan some towbar units don't like the newer LED lights that alot of new stuff has fitted
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04 XC90 D5 --- Big bus
00 pug 306HDi --- Run about
88 pug 309GTi --- Project track car
07 CB600 Hornet --- 2 wheel fun
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