Number of Original Circuits

[Doppleganger]

Anyone know how many circuits are in the original square's fuse panel (loaded...AC, PW, cruise, etc)?

Thanks.

 

[C10MixMaster]

Here's a breakdown of my 77


· A – Fuse 15A - Traffic Hazard / Stop
· B - Fuse 20A - Tail, Courtesy Lamps BATT
· C - Receptacle – ACC Fused at D
Radio, Cruise Control,
· D - Fuse 15A - Radio ACC receptacle C
· E - Fuse 25A wipers
· F - Receptacle – BATT Fused at I orange
Courtesy lights, Radio, power locks
· G – Fuse 20A - Heater / Air Cond. A/C receptacle H
· H - Receptacle – A/C fused at G
· I – Fuse 20A - Accessory receptacle F
· J – Fuse 4A - Panel Lights
· K - Receptacle – IG fused at O
Fuel solenoid, pw relay
· M - Receptacle - Accessory Lamps fused at J
Radio light
· O – Fuse 15A - Reversing Lamps, Turn Signals Receptacle K pink / black tracer
· P – Fuse 4A - Instrument Cluster Feed

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[Doppleganger]

Thanks much!

I count 14? I'm looking at a wiring kit and wondered how many was too little / much. Probably go at least 21.

 

[75gmck25]

I'd check the fuse panel for a '79 or later, since I believe that was when they added power windows and locks. For even a little more flexibility I would look at an '87 or later, since they also had to provide power for TBI fuel injection.

Bruce

 

[Doppleganger]

Cant imagine them having more than 21 but never know. My truck has to be completely rewired....no way around it. My 85 was pretty stripped but I'm going all power, FI, etc.

THX

 

[CDOVA]

If I plug my radio into Batt (f) will it drain my battery? I plugged into it and I notice the aftermarket radio stays on after I turn off the truck. I see you have it labeled “radio” I’m guessing I’m ok, correct?

 

[Poppy 87]

If I plug my radio into Batt (f) will it drain my battery? I plugged into it and I notice the aftermarket radio stays on after I turn off the truck. I see you have it labeled “radio” I’m guessing I’m ok, correct?

I would use "C" listed acc or accessory, try that, it should power down with key off. Best bet is to use the schematic diagram for your truck

 

[CDOVA]

I have the exact same as above so it should work. Thanks

 

[C10MixMaster]

I have the exact same as above so it should work. Thanks

most aftermarket radios have a always hot B+ lead, for the memory, that would connect to F on the above picture. most aftermarket radios also have a switched lead or accessory lead, to turn it on and off, that would connect to C on the above picture

the factory radio connects to accessory or the C circuit only .