rear defogger motor speeds ???

Hi all, I have a 69 Superbee it has the rear defogger option , a couple of years back I had the rear defogger motor rebuilt..... so today I install the motor and it works. Now, here's my issue, I notice that the defogger switch has (3) positions kinda like; off - low - hi speed but the motor has only one speed, (hi). My question is, is this normal operation between the switch and motor or am I missing something. Maybe this switch is used for other applications where (2) on positions are needed ??

Later, BUZZ

Shop manual shows two speeds. Page 8-96. Motor should have a white lead which is 'low' and a black lead which is 'hi'.

Thanks for the reply, I looked at the diagram that you mentioned and it's not like that at all.....only one wire from the dash right to the defogger motor and only one connector at the defogger motor, so that all lines up, btw, both the wire and defog motor (are) original to the car.... it's just after 40 years of restoration I don't recall having felt (2) clicks of the switch but only one motor speed....still confused , but at least it works.

Later, BUZZ

If that is what your service manual says I have no idea what you are looking at. Here is page 8-96 From the 1969 Charger Coronet Dart Service Manual.

Yes, I too have this service manual and have carefully studied that wiring diagram....what i'am saying is that my car has been in parts for 40 years (restoration) and both the defogger motor and switch are the original set-up that came with the car, but like I said I had the defogger motor rebuilt when I sent it in to be rebuilt it had the provision for one wire not two as the diagram shows also the def. switch original to the car has two positions (but) there is only one wire that goes directly from the dash to the motor. However like mentioned 40 years has gone by of non use so I can't remember having used the defogger that much since it's only driven in the summer. Just want to know if there is others out there with (this) type of strange set-up.

Later, BUZZ

I get it. Sorry for the brain fart, I misunderstood what you were saying. This intrigued me so I've done a little more digging and what it looks like is that there should be a resistor block on the blower. The body harness plugs into it with a two conductor plug (the black and white wires) and then the blower motor plugs into it with a single conductor. This is one of many photos I found.

Wow, my motor is totally different , just motor and mounting plate no resistor or resistor plate. On the picture that you supplied note the single green wire that comes out of the motor...... well thats all I have on my def. motor, been like that since the car was new along with the single black wire that comes from the dash that plugs into the single green wire connector at the motor. when I sent out the motor to be rebuilt (Jules) the rebuilder said nothing like I was missing something or it's the wrong motor or anything of that nature. I guess that in his view nothing seemed out of place,weird or missing, so back to my original question, was this an error, a factory change over or just normal on some cars ?

Later,BUZZ

I don't know what to tell you. Looked in the '69 parts book and there is no listing that I can find for a resistor with the rear window defogger blower. I had a '68 Charger years ago with that option, I wish I'd paid more attention. Do you have a picture of what you have?

One of the C11/C12 wires is a "resistance" wire.
Most likely the C12 (low) to motor.
Was used in place of a resistor.

Assembly line vs dealer installation?

This is what is what I have mounted in my car.

One last question, if you unplug the motor at the connector shown in your last picture, what does the body side of the connector look like and does it have two wires or one wire connected to it?

Hi, just one connector on each side.... I know what you mean, could be one plastic connector with (2) spades inside but this is not the case. What you see is exactly what's there,one black wire to the connector, then out the other side of the connector where the single wire is now a very dark green right up to the motor and the black wire coming out of the motor grounds itself to the motor housing.

Later, BUZZ

Well, I'm fresh out of ideas. I was hoping someone that has the rear window defogger would chime in but so far no go.

Thanks for trying to figure this out with me. If it wasn't for the fact that I was testing out the defogger and noticed I had two positions on the switch but only one motor speed,this thread never would have seen the light of day. Still a strange set-up but hey everything is new or rebuilt and works perfectly , plus the fact it's a summer car don't think I'll be using the defogger when it's 85 deg. + outside.

Later,BUZZ

1st: are there 2 wires going to the switch?
2nd: Does it the motor work when using switch in both positions.
Note: some years/models they used a "resistance" wire in-leau of a resistor.
That's how it would reduce the speed.

Here you go. Why it confuses many people.
See attached pic from 70 manual.

yes..... that's the way my defogger is wired, strange that the wiring is for a 70 fury, could it be that my 69 superbee got this set-up by mistake or was this like a mid year change over? I guess I'll dig deeper into this and locate this (white) resistor to see if the wire is not damaged, could be the reason why I only have one motor speed.

Later, BUZZ

update; went into the garage last night to test this resistor wire thing, does anyone know what the resistance values should be ? I get the black wire, I tested it ,4 ohms, test the white wire, same thing 4 ohms...... seems to me white wire should have a higher ohms reading, unless I'm testing this wrong. I have one test lead plugged to connector that plugs to the motor and the other lead plugs to the white/black wire connector at the kick panel location where I touch the test lead to one or the other wire. Back to my first post, I totally forgot about that double wire connector at the kick panel..... so I stated that it had (1) wire from the dash to the motor, I was totally wrong (my bad) if I would've spotted the kick panel connector that would've explained the (2) position switch. I guess that's what you get when the car is in parts for 40 plus years.

Later, BUZZ

Is there this junction on your wiring harness?
4 ohms seems high for a standard type wire of that length.

Yes there is a junction on the harness, but one of those wires as the diagram states is a (resistance) wire in this case the white wire. Now if I'm getting 4ohms at the black wire logically I should be getting a higher resistance on the white wire which should make the motor turn at low speed, no? In my case both wires give me 4 ohms, I tested the switch and it works correctly and the motor works also but as stated just one speed (Hi)

Later, BUZZ