Originally Posted by DazC
Originally Posted by safechav
I believe the power supply is derived from the fuel pump relay from what i remember off the top of my head?
Yes. The fuse for the S1 KE system is the fuel pump fuse, not the heated seats fuse like the S2. SO if the KE fuse has blown, the car won't even start (for obvious reasons).
Reasons for why there is no power to the KE box could be almost anything. I'd have to look at the diagram and compile a list of suggested possibilities.
Paul, if your car has had this extra wire fitted by someone who doesn't know the S1, it could be that in it's past, it has lost the signal to the fuel pump relay and they have run in this wire to get it going again. It will be green for the standard rev counter wire. The fuel pump relay needs the raw signal direct from the distributor which is on a green/yellow (standard wiring loom).
Use your multimeter set on Ohms (funny upside down horse shoe symbol) at the lowest setting. If the meter has a buzzer, switch it on cos it will make life easier. Touch one lead of the meter to the green/yellow (might be a green/red)) on the distributor and touch the other on the green/yellow at the fuel pump relay. The meter should either buzz, or give a reading as close to zero as possible. This means the wire is continuous and not broken. If you get a high reading or no reading at all, then there is a problem.
Sorry my mistake, the left fuse is the Fuel Injection fuse isn't it, and the right one is the heated seat fuse slot, without looking at the diagrams i forget because i have fuses in every slot on mine
As sugggested i would do some simple continuity checks and check the glass fuse inside the Fuel Pump relay.