This wire can then be routed into the car via the large bulkhead wiring loom grommet behind the battery, then
across underneath the fuse box, behind the heater, under the instrument panel, and back into the engine bay via another bulkhead grommet, then down to the relay and connected to the relay 30 terminal.
The switched feed is picked up by breaking into the white wire from the rear of the ignition switch, (if in
doubt consult your cars specific wiring diagram in Haynes or Leyland manual) thus when the ignition is switched off, the fan is also switched off. This wire is routed into the engine bay to the relay terminal 86.
Run a wire to the nearest earth terminal (heater control connections) from the over ride switch, then route a wire from the over ride switch 2nd terminal into the engine bay to the relay terminal 85.
Run a wire to the nearest earth terminal from the “Fan on” indicator light, then route a wire from the “Fan on” indicator light 2nd terminal into the engine bay to the relay terminal 87.
Run a wire from the Thermal Control Unit NO terminal to the relay terminal 85.
Run a wire from the Thermal Control Unit C terminal to the nearest earth terminals.
The fan has 2 wires from it, run the black across to the front bumper and then to the nearest earth terminal,
then route the green across to the front bumper, clip to light looms, and route through RH light loom grommet into engine bay and connect to relay terminal 87.
Tidy up all the wiring, making sure all wires are securely clipped and bound in insulating tape. Ensure no bare
terminals are exposed, and ensure you cannot catch any wires under dashboard with feet.
Connect the battery, then check the operation of override switch and “fan on” light, and ensure fan
runs OK and is pushing air through the radiator.
Turn down the Thermal Control Unit to lowest setting.
Ensure all hoses and fittings are secure and tight.
Ensure coolant system is filled, and that there are no air locks, or water leaks.
Run engine until the Thermal Control Unit cuts in and starts the fan, then check “Fan on” light operates.
Now re-start the engine and adjust the temperature that you require the Thermal Control Unit to operate the
fan, this may vary from car to car, and is a matter of trial and error, however you should know the normal operating temperature of your TR7, best to go a few degrees above your normal operating temperature.
With engine running, ensure that fan runs until engine cools down, then check that when temperature is again at
fan operating point that the fan will consistently cool the engine.