AC-Fan Modification: 1993 240

[93Regina]

Note - Diagram is for late model 1993-240, which at the battery, has four fuses. So, I'm explaining for 1993-240 late production model, which has an electric fan in front of radiator. If yours has an electric AC-fan, I might be able to explain it, if I have an electric diagram.
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Below Photo Explained

At point D (Fan Relay), all it takes is a ground circuit at terminal 85 on relay (D) to activate fan, if AC is turned on, and there is power at terminal 86 on relay (D).

1. With AC Working - Since fan is grounded (SB Wire), all it takes is a power wire attached to fan (G) at R-wire; so you hookup a switch inside vehicle with 12-volts hooked to it on say 12 gauge insulated wire; I would also put a 20 amp inline fuse on this circuit.

Issue here is only inside vehicle circuit to hook wire to would be 25 amp heater/AC fan-motor, which would be fine, if AC/Heater fan was not running. In other words, too much current on one circuit.

2. Another Method - At battery, with a 20 amp inline fuse going to a Bosch type Relay at terminals 30 and 86, with feed wire (87) going to fan, then from inside vehicle, use a toggle switch that is grounded on one side. With a wire running from other side of this toggle switch, this wire would activate relay (terminal 85) when toggle switch is flipped.

After this photo, I will explain relay wiring more...

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Relay

At battery, a 20 amp inline fuse would hook to relay's terminals 30 & 86

Terminal 87 would be hooked to electric fan's positive wire (Item G @ R-wire)

Terminal 85 would have a wire going to inside vehicle, and hooked to a toggle switch that is grounded on one side.

Terminal 87a is not used

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