Frogger2662 Posted February 29 Share Posted February 29 I need wiring help. Back story first. I have a 1984 F150 that has been rewired by a previous owner. Aftermarket harness and fuse panel. He did a decent job on what he did. Truck runs and drives fine with all lights and gauges working. The climate control wiring was never rewired so I have no climate control. The truck came with A/C and heat. No compressor are condensor installed in the truck at the present time. Is it possible for me just to wire the blower motor side and use just the heater and defroster? I have the pigtails voming from the back of the control panel. No other wiring. Link to comment Share on other sites More sharing options...
ArdWrknTrk Posted February 29 Share Posted February 29 With the truck "rewired" it's hard to know or understand what someone else has done (and now it's impossible to UNdo) You need serious key on fused power to the blower motor, and hefty grounds. (I'd suggest a relay somewhere between the starter relay and blower motor) If you don't have A/C you can ignore the compressor clutch and throttle kicker wiring. What more do you need to know? Link to comment Share on other sites More sharing options...
Frogger2662 Posted February 29 Author Share Posted February 29 The wiring harness used is a Ron Frances Express system. There is a 30 amp circut dedicated for heat and air. I will be having more questons. This is the fuse panel being used. Link to comment Share on other sites More sharing options...
ArdWrknTrk Posted February 29 Share Posted February 29 The wiring harness used is a Ron Frances Express system. There is a 30 amp circut dedicated for heat and air. I will be having more questons. This is the fuse panel being used. I still wouldn't run 30A in, to the cab fuse box, and back out to the blower... Somewhere Gary has all the drop tests and stuff when he picked up some relays from Texas Industrial Electric. I suggested that he measure actual fan output, but I guess having real data is too much. 🤷♂️ Link to comment Share on other sites More sharing options...
Frogger2662 Posted February 29 Author Share Posted February 29 I still wouldn't run 30A in, to the cab fuse box, and back out to the blower... Somewhere Gary has all the drop tests and stuff when he picked up some relays from Texas Industrial Electric. I suggested that he measure actual fan output, but I guess having real data is too much. 🤷♂️ Ok. How does this sound. I can use the circuit in the fuse panel as my trigger for the relay I wold mount on the fender well. Bring in power to the relay from the battery. What gauge wire should I be using? Link to comment Share on other sites More sharing options...
ArdWrknTrk Posted February 29 Share Posted February 29 Ok. How does this sound. I can use the circuit in the fuse panel as my trigger for the relay I wold mount on the fender well. Bring in power to the relay from the battery. What gauge wire should I be using? Does your wiring 'kit' still incorporate the Ford style fender mounted starter relay? If so, I'd use the hot (battery) post* of the relay for a bus, and go with 10Ga primary wire to 30 of the relay and 87 to the blower. Then I would make sure the ground side , from the resistor block to the controls was solid, and bring the ground side of the control to the back side of the firewall ground stud, going to the engine (just below the wiper motor) Be sure to get a continuous duty rated relay. Link to comment Share on other sites More sharing options...
Frogger2662 Posted February 29 Author Share Posted February 29 Does your wiring 'kit' still incorporate the Ford style fender mounted starter relay? If so, I'd use the hot (battery) post* of the relay for a bus, and go with 10Ga primary wire to 30 of the relay and 87 to the blower. Then I would make sure the ground side , from the resistor block to the controls was solid, and bring the ground side of the control to the back side of the firewall ground stud, going to the engine (just below the wiper motor) Be sure to get a continuous duty rated relay. Yes it does have the starter relay on the fender. He updated the starter to the later style. What size wire should I use in the rest of the system after the blower motor. Link to comment Share on other sites More sharing options...
ArdWrknTrk Posted February 29 Share Posted February 29 Yes it does have the starter relay on the fender. He updated the starter to the later style. What size wire should I use in the rest of the system after the blower motor. A chain is only as strong as the weakest link. If you don't want voltage drop and hot wires you should look at Gary's thread. 💡 Link to comment Share on other sites More sharing options...
Frogger2662 Posted February 29 Author Share Posted February 29 A chain is only as strong as the weakest link. If you don't want voltage drop and hot wires you should look at Gary's thread. 💡 Thanks. Will do. When I have more questons I will ask again. Link to comment Share on other sites More sharing options...
ArdWrknTrk Posted February 29 Share Posted February 29 Thanks. Will do. When I have more questons I will ask again. https://forum.garysgaragemahal.com/Next-issue-Heater-air-flow-tp145358.html Link to comment Share on other sites More sharing options...
Recommended Posts