Date: Sun, 4 Jun 2006 21:54:54 +0100 From: "John Hudson" <mypcnospam.com> Subject: Re: 95 towbar wiring
"graham" <grahamnospampam.thanks> wrote in message news:448010dd$0$22880$ed2619ecnospamnntp-reader01.plus.net... > Does anybody know whether a relay is required when wiring in the trailer > lights (just brake & indicators)? > As a matter of course I'd think isolating the electrics like this would > be a good way to go. > > BUT, according to the parts counter at my local garage the saab "towbar > wiring kit" is just the wires with the correct plug on the end (for > which £40 seems rather steep). > Which suggests that either no relay is required or even that the > existing "pre-wiring" is already setup to handle the towbar electrics > (rather than just being a spur off the main loom), and perhaps would be > confused if a relay was fitted! > > I can see it both ways - does anybody know exactly what the setup is > here? If you do don't keep it to yourself :) > > g > >If its coming from a main dealer it will be expensive. You do not use a relay for rear lighting on a trailer.. Relays are only used when a power supply is needed for a caravan fridge, etc. The relay only works when the engine is running to avoid a flat battery if you forget to switch off the appliance when the car is stopped. A relay for the connection between the car lights and the trailer lights could be dangerous if it failed plus why have a relay there anyway?
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