Thermo Fan Wiring

Hi guys I am wiring up a thermo fan, I have attached the wiring diagram that came with it but what i want to do is have a switch where I can have it run off the thermo switch but also if i need to manually override it so it comes on straight away. I have shown the switch in the diagram, does anyone knwo where i wire the switch into? thanks.

Thats an LPG setup diagram

Sorry copied the wrong diagram, ive got the right one up now, any ideas how to wire the switch in? thanks.

run a wire from a power source, eg. battery or acc wire and put a switch in and the end of the wire goes to 86 on the relay. when the switch is turned on it will start the fan.

Why would you want to manually overide the automatic system? to much margin for overheating the engine,the thermal switch should be adjustable

Because in the event of the thermo switch failing i want backup to be able to run the fan on command rather than be stranded with no cooling, better to have a few more wires than be stuck somewhere having to wire it up then.

Put the switch accross 30 and 86 in your pic

I have the wire going into 86 hooked onto the power connection of my 3 position switch.

Position 1 is hooked onto the thermal switch.
Position 3 is hooked onto a continous power supply
Position 2 is an 'OFF' position.

When the switch is up, everything runs of the thermal switch.
When the switch is in the middle, the fan is off (i.e. for water crossings)
When the switch is down the fans are continously on

Bingo, exactly what i was looking for Clown Boy, thanks for that! Does this pic look right now when its on 1 the fan is on all the time, when its on 2 its through thermo and when its in the middle its off, thanks mate.

Why would you want to manually overide the automatic system? to much margin for overheating the engine,the thermal switch should be adjustable

I have an over ride on mine to switch it of if I dunk it in a creek or something

Because in the event of the thermo switch failing i want backup to be able to run the fan on command rather than be stranded with no cooling, better to have a few more wires than be stuck somewhere having to wire it up then.

Sorry mate , I understand where your coming from now, I ran davis craig thermos in my street and drag cars for years , never had any problems but saying that i never dunked any in water:)

No worries mate, always good to ask and find out. Hopefully mine never fail as well.

Sorry mate, was off for a couple of days.

?Yes that is correct. Except for my always on position I wired a direct power supply (not off ignition).

Personal preference. I figured if I come close to overheating I can turn the engine off, leave the fans on and restart car in 10 minutes to recycle around the cooler water.

Probably not much of a difference though.