Date: Tue, 06 Jun 2006 21:42:50 +0100 From: graham <grahamnospampam.thanks> Subject: Re: 95 towbar wiring
Bob wrote: > On Sun, 4 Jun 2006 21:54:54 +0100, "John Hudson" <mypcnospam.com> > wrote: > > >>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? > > > Yes, you *do* use a relay. You do it because the cars existing wiring > is only designed to handle a certain amount of current. The relay > allows you to add only a minor amount of flow to the existing circuit > and then the relay handles the load of the new lights. > > This is particularly important in a recent Saab since most of the > wiring passes through a computer that controls all lighting. > Overloading it is a really bad idea. So does the "pre-wiring" or whatever it is, sitting in the spare wheel compartment ready to be plugged into, already make allowance for this? The saab garage parts counter seemed to think the saab "wiring harness kit" or whatever it is, was essentially just a plug and wires. Where can I get hold of a wiring diagram for the car ? rgds, g.
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