trying to wire up a fan switch direct to the rad fans,
using this piccie that Rich gave me

but if i wire up the switch using this relay diagram as a guide it dont work at all, can anyone see what i am doing wrong?
basically i connect
No 30 to the battery
No 85 to ground
No 86 to on/off switch
No 87 or 87a to fans

but it dont work or turn on, what am i missing?

 

Someone call 999 and order a fire engine

 

got em on speed dial

 

Ground on the fans

 

Funnily when I phond them they said that Kaz had already informed them and they are ready and waiting......

 

@ steve

the ground on the fans and the ground for the switch I checked as well

 

basicaly you are only switching the live feed to the fans, the ground on the relay is picked up at the nearest point to the relay. The grond to the fans is as normal, or run direct from the batt

 

Well sounds like ya have it wired correctly, checked the fuses? Relay internally fused?

Do the fans work if you supply them direct from battery?
Does the relay click when switch is thrown?

edit: thermostat aint still in circuit is it

 

The other side of the switch needs to be battery 12v +ve Not Ground.

 

what is used as the trigger? the way i'd do it is to find which wire is the output from the fan switch in the rad, cut this wire and redirect it to the trigger input of the relay, also if you want an overide switch to turn on when you like run a 30a feed through a switch on the dash? and to the same input as the trigger before, that way you can turn them on when you want but also have the back-up of the fan switch if you forget

 

Missed that there's ya problem.

 

What it ment was you can use trigger 86 as a live switch, or you can use ground 85 as a negative trigger as some ecu's use negitive outputs to trigger relays. So if you use a live trigger 86 you need a permanent groundon 85, if you are using a negative output as a trigger on 85 you need a permanent feed on 86

 

 

cool, cheers

 

what ever you do when you have finished this please please MAKE SURE THE FANS ARE SPINNING THE CORRECT WAY as its easy to get them going backwards,ive seen so many engines fooked this way before.

 

yep, when its done i am gonna get SCC boys to give everything the once over, as i want it to be pretty reliable and also when it comes to selling it i dont want to sell something thats not 100% if that makes sense

 

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