Chicken Drumstick Posted April 29, 2020 Share Posted April 29, 2020 Can anyone help me out. Want to wire in my heater. I’m retro fitting into a Series. anyone know which wire does what on the heater? Green/grey Green/yellow Blue/green Thanks. Quote Link to comment Share on other sites More sharing options...
western Posted April 29, 2020 Share Posted April 29, 2020 What vehicle is the heater unit from? From my 110 wiring diagrams - - - - - Green/yellow = slow speed Green /slate grey = ful speed Blue/green should be Purple/green =12v from fuse box The only blue & green in a 90,110 is blue/light green from column switch to wiper motor Quote Link to comment Share on other sites More sharing options...
Retroanaconda Posted April 29, 2020 Share Posted April 29, 2020 It’s a ignition-switched 12v supply into the box and then there are two returns which are switched to earth by the heater control lever, the full speed one directly and the low speed one via the resistor inside the heater case. I put a Defender heater in my Series III and I used two relays to do the switching to ground as the Series switch is set up to switch the live and not the earth. So I had a 12v supply to the heater through an auxiliary fuse box and then both high and low speed switched to ground by relays, those being controlled by the factory heater 12v feeds. Quote Link to comment Share on other sites More sharing options...
Chicken Drumstick Posted April 29, 2020 Author Share Posted April 29, 2020 Thanks. That should be enough info to get me going. Love this site for such awesome and knowledgeable members!!! Afraid I don't know what vehicle the heater is from. I pulled it out of a part finished 88 coiler project that had been abandoned. Didn't cost me anything though. Quote Link to comment Share on other sites More sharing options...
macclad Posted April 29, 2020 Share Posted April 29, 2020 (edited) Hi can anyone give me a simple wiring diagram for my lever type heater blower switch, i,m only getting 3vs at the live terminals but 12v at the fuse, does it go battery,-fuse,- switch,- motor? its not working at all, was trying to replace lever with a 2 speed rotary knob switch. also what is fuse 7 for, cos there a link wire from blower fuse to it? Cheers Mike Edited April 29, 2020 by macclad Quote Link to comment Share on other sites More sharing options...
Snagger Posted April 29, 2020 Share Posted April 29, 2020 Yep, just run a fused feed to that blue wire and connect the other two the the existing motor’s feeds. Then remove the live feed from the fuse box to dash switch and connect that terminal to a good earth. That’ll get it working, but you’ll just have to make sure you switch it off before leaving the vehicle. You can use the old positive feed to the switch to control a relay that will allow the new earth from the switch to connect to a ground in the dash, and then it’ll be protected from draining the battery by the ignition switch, just like before. Quote Link to comment Share on other sites More sharing options...
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