Have not had it out for a good run for a couple of weeks so thought
I would plug in the battery charger for good measure. When I did
this, I noticed 2 wires, one red, other green, terminating in a
white plug connector just hanging by the negative battery
terminal. Can find no indication of where they are supposed to be
plugged into. Everything (except external trunk release button)
works fine. Any ideas of what these wires do or where they
connect? 2000 S-Type 4.0 sport.–
Rex Delay
Nanaimo, BC, Canada
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In reply to a message from Rex Delay sent Sun 9 Jan 2011:
This plug is used by the dealership to disable the electrics while
the car is in the showroom as I understand it.
However if this plug should get wet and corroded it can cause
battery drain issues so keep it tucked up behind the boot trim in
case you get the wet boot problem.
In my car it was behind the trim and out of sight.–
The original message included these comments:
works fine. Any ideas of what these wires do or where they
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In reply to a message from 12RM sent Tue 11 Jan 2011:
Mine has it as well, dangling down from the trim covering
the RR taillight area. But the wires are red and green/blue.
The wiring diagram shows this on Figure 01.1 as going to a
Transit Isolation Relay. There is a timer inside the relay.
It isolates the negative ground cable from the grounding
point. It is in turn controlled by an Inertia Switch.
With names like that, my guess is this was something to
protect the circuits when the car is bumping around on a
rail car or being loaded onto a ship, i.e. in transit to the
dealer. If there was a bump, there would be some time period
before you could start the car. The dealer would remove it
before sale and attach the negative cable to ground.
Thanks for pointing it out. Mine was not in the wet but
could have been.–
XK120 FHC, Mark V saloon, XJ12L Series II, S-Type 3.0
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