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Coolerman said:Not knowing anything about the HJ47 wiring I can only offer you my best guess.
You seem to be referring to an existing relay? If that's the case and you know where the relay is located it's quite easy to figure out which pin on the relay is the switched power. Unplug the relay and look at it. Printed somewhere on the relay will be a diagram of each pin and it's number. If it's a standard automotive relay then pin 30 will be the always hot when key on pin and pin 87 and 87a are the switched pins. 87 will be the NO or Normally open contact (it will have power only when the relay is ON) and pin 87a will be the NC or Normally Closed contact( it will have power only when the relay is OFF) If the relay is not labeled then you need a meter set to read DC volts to determine which pin is which.
What are you wanting to power from this relay?
Do you have a schematic for your 'new' truck? If you do that will really help figure out the wiring.
Coolerman said:I found schematics for a 1981 HJ47and for a 1983 BJ40 which may be closer to your HJ. They may be different from your 83 but Toyota stuck to the same basic system for long periods of time. You can download these and other schematics here:Coolerman's Electrical Schematics and FSM File Retrieval
On the 1981 HJ47/83 BJ40 the ACC circuit does not have a relay. It consists of two circuits one is the power outlet or cigar lighter on a 15 amp fuse and the other is the radio circuit on a 5 amp fuse.
As was pointed out it's easy to add a relay to the so that it's switched by the ACC circuit. You would simply add a wire to the Blue/Red wire at the fuse box, connect that to terminal # 86 on your new relay, connect terminal #85 to a good ground, connect terminal #30 to a FUSED wire that goes straight to the battery, and connect terminal # 87 to the device you want to power.
Why are you rewiring the heater fan? Also does your truck not already have the power outlet wired? We need more details as to what you are actually wanting to accomplish.