converted_to_datsun Posted May 20, 2012 Report Share Posted May 20, 2012 Ever since I got my 620 there's been two wires hanging below the dash. One has another wire spliced into it and the hook th the fan switch thing. One my high speed has been working so I figure the other 2 speeds must be those wires. I found where they go but the problem is which goes where? There's to connection points on the motor... Help? Quote Link to comment
datzenmike Posted May 20, 2012 Report Share Posted May 20, 2012 Power goes to and through the motor and from there through the switch to ground. To get a slower speed it may pass through a resistance and then to ground. The 'resistance' is a small coil of wire mounted inside the blower case (to keep it cool) above the gas peddle on the 620. The low speed resistance coil looks like this and plugs on top the blower part of the heater assy. on the driver's side. Probably blue wires going to it? 1 Quote Link to comment
converted_to_datsun Posted May 20, 2012 Author Report Share Posted May 20, 2012 That looks like the right part. My wires are yellow and one seems to splice to a black wire that seems to be a ground. Just curious if it matters which wire goes where Quote Link to comment
datzenmike Posted May 20, 2012 Report Share Posted May 20, 2012 The coil in the picture will work the same if wired backwards. Quote Link to comment
converted_to_datsun Posted May 20, 2012 Author Report Share Posted May 20, 2012 Awesome! I just didn't want to hook it up wrong and fry something. Now there's just 1500 more things to fix haha Quote Link to comment
ohmrchristopher Posted May 21, 2012 Report Share Posted May 21, 2012 I have pictures in my build thread. I took mine apart and fixed it as over the years the heat has wrecked it. Quote Link to comment
converted_to_datsun Posted May 21, 2012 Author Report Share Posted May 21, 2012 Eventually I'll have to do that too. Mine has been used and abused Quote Link to comment
heretic Posted April 18, 2013 Report Share Posted April 18, 2013 does anyone know the resistance rating of the coil? Quote Link to comment
datzenmike Posted April 18, 2013 Report Share Posted April 18, 2013 Not off hand but its the wattage rating that is important. It's going to get very hot. That's why it's mounted in the air stream from the fan, to cool it. You would need to know the current drawn my the motor. Certainly it's less than the fuse used to power it. Say 6 amps (just a guess) Using Ohm's Law we can work out the motor resistance by R = V/I or resistance = voltage (12) over I (current 6 amps) so the resistance would be 2 ohms. So if we add another 2 ohms of resistance in line with the motor resistance (2 ohms for a total of 4 ohms) the motor will flow half the current and theoretically run at half speed. Now power in watts, is V x I or Voltage (12) x I (current 3amps) or 36 watts. Your resistor must be able to handle 36 watts. This is just a guess that the motor draws 6 amps. It may only draw 3 or maybe 8... I don't know. 1 Quote Link to comment
heretic Posted April 18, 2013 Report Share Posted April 18, 2013 :) perfect I'll just test the motors amperage at full voltage & work backwards from there THANKS.!!! Quote Link to comment
Seeker > 620 KC Posted February 16, 2017 Report Share Posted February 16, 2017 My looped coil is broken close to one end. How can you fix them? Solder? Twist together? Quote Link to comment
Seeker > 620 KC Posted February 16, 2017 Report Share Posted February 16, 2017 Just had another idea... I'm wondering if I could cut in half (or thirds) one of those barrel wire connectors for connecting two pieces of wire together. I'd have to find one with a large enough id to slide over both the broken ends. Then if the coil material is too hard or brittle, maybe I could solder the ends to the connector? Quote Link to comment
Hrvat9 Posted February 18, 2017 Report Share Posted February 18, 2017 Mine fell off/broke off one end. I just hooked it back up and got the low setting for the blower back Quote Link to comment
datzenmike Posted February 18, 2017 Report Share Posted February 18, 2017 It gets too hot for solder, I think and why it's inside where the air blows over it to keep it cool. Get a small diameter piece of metal tubing, smaller the better, about 1/4" long. Shove both ends in and crush with vice grips or crimping tool. Quote Link to comment
abbylind Posted February 19, 2017 Report Share Posted February 19, 2017 IIRC the coil heats up and acts as a heat source until the water warms up from the radiator. My 86 M1008 (Chevy pick up) has a similar coil it does dual duty, one reducing the fan blower speed and two pre heating the air from the heater core. 1 Quote Link to comment
datzenmike Posted February 20, 2017 Report Share Posted February 20, 2017 IIRC the coil heats up and acts as a heat source until the water warms up from the radiator. My 86 M1008 (Chevy pick up) has a similar coil it does dual duty, one reducing the fan blower speed and two pre heating the air from the heater core. :lol: So why doesn' t high speed have this too? Or if it works, it only works as fast as the water heating up. :lol: Next time it's cold, start up your heater like normal without the engine running and see how warm the air (doesn't) get. Quote Link to comment
Goemon Posted September 5, 2020 Report Share Posted September 5, 2020 This isn't even wired correctly. The piece the coil is connected to has a certain purpose and that is not it. Who knows? Quote Link to comment
datzenmike Posted September 5, 2020 Report Share Posted September 5, 2020 I had a 620 but I don't remember if this was my picture or not. The 1200 has one similar. I guess if the wire broke off you could re attach it with a nut and bolt. Quote Link to comment
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