Need quick help. (Electrical)

[95bajaguy]

Anyone have a diagram of the engine fuse box wiring under the box? (I need to know where the wires go) the WOT/ac relay does not work even with a good relay in it.

 

[95bajaguy]

95 4.0 v6 by the way

 

[Andy D]

theres relays and theres relays. did you get the right one?

 

[RonD]

WOT relay needs to be a 5 post relay.

It passes power to the AC compressor when it is OFF, computer grounds this relay at wide open throttle to turn it on and that cuts power to the compressor.

Image of automotive relay posts here: http://www.reuk.co.uk/OtherImages/5-pin-12V-automotive-relay.jpg

Under side will have a Red wire that will have 12v when key is on
A pink/yellow wire that runs to the Computer's Pin 69(the ground for this relay)
These are posts 85 and 86

Then a Dark Green/Orange wire that comes from AC switch in cab, post 30 on relay, has 12v when AC switch is on and key is on
And a Black/yellow wire that runs to AC Compressor, post 87A on relay

Post 87 is not connected to anything

So when Relay is open/off AC compressor is connected to the AC switch so gets power, posts 30 and 87A are connected

When Computer grounds the relay it closes/on so disconnects post 87A from 30, and power to compressor is cut.

A 4 post automotive relay has no post 87A, so wouldn't work for this application