heater placebo upgrade help

I am attempting to upgrade my factory driver side heater in my 59 cj5 with a PM102 new heater motor from a chevy blazer purchased at oreilly for 20 bucks. It seems like a drop in replacement with no modifications required but the new motor spins the wrong direction. I have already been told I need to open the new motor and reverse the rotation but I am not sure how to do this?

My heater core is in firewall side and my motor is mounted on the cab side of the placebo heater

Can anyone direct me on how to make this clockwise motor spin counter clockwise from the shaft end?

Thanks

this HTML class. Value is http://s1174.ph

 

this HTML class. Value is http://s1174.ph

 

Linky no worky.

I am assuming there is a reason you can't just swap the polarity of two input wires?

 

The old comcast webpage from Binky is down, I did this to mine a few years back. Basically you take the rivets out of the motor housing and then swap the wires on the motor, reassemble and put back together, it only took about 40 minutes or so if I remember correctly. I cannot find any other links to do this.

 

I'm not sure why the pics ain't working I did it on photobucket.com like I always have but the early cj5 site looks different for me today? Maybe that has something to do with it.

There are no wires on the new motor to swap. Grounds through case and the power is just a spade terminal mounted right on the motor so I assume switch needs to be Resistor type

 

What wire do I have to swap? Will I know when I get inside?

Am I swapping wires on brushes or what? I have never done this before.

I got the PM102 part number from a number of other sites but no one said how to rewire the motor

 

Also how should I put the motor back together when I'm done? Simple aluminum pop rivets?

 

Swapping wires on the brushes, pop rivets work fine.

 

I still cant get pictures to work on this new site.

I pulled apart the new motor and the nose cover holds the brushes. the power spade terminal is wired to the 1 wire on the one brush
and the other 1 wire coming off the other brush is connected to the case of the motor using a rivet. could you help expain this a little further I think I understand but I want to make sure.

if I swapped the power to the other currently grounded brush and grounded the brush that is currently connected to the power. this sounds like what you are saying but I don't understand how this would make it spin the other way around I would think It would still spin the same direction

again thanks for the help and thanks for staying with me on this

 

http://www.earlycj5.com/xf_cj5/index.php?media/20151101_181603.53/full

 

I thought the same way you did, but it did work to simply swap them, maybe someone else can chime in. I did this so long ago.

 

By swapping the wires in effect you are reversing the polarity of the field which makes the motor run the opposite way.

 

Do I have to cut the wires and re crimp the one and put a new round connector on the one that currently doesnt.

Or can I just leave the wires connected to the brushes as they are already and just move the brushes to the opposite side as a whole?

 

Here's a better view

 

You should be able to swap the brushes.

Like Nick says, to reverse rotation, you change the field polarity wrt the armature polarity. By swapping the brushes, you are doing the same thing, but changing the armature polarity instead of the field polarity.

An AC-DC motor (ie not permanent magnet and not synchronous) uses the applied current to power both the field and the armature. If you simply reverse the polarity to the motor, it changes the polarity to both the field and the armature. 1 * 1 = -1 * -1 = 1. This results in no change in rotation. You should be able to change the polarity of either the field or the armature and make the motor reverse.

 

Another possibility would be to rotate the end plate with the brushes 180 degrees wrt the field.

 

Well I am finished changing the direction of this motor thanks to all your help. I still don't understand how this changed the direction but hey it worked so that's all that matters.

what I did was I opened up the motor and drilled out the rivets holding the board that the brushes are attached to. then I rotated the hole board brushes and all 180 degrees and then re attached it using aluminum pop rivets. then I re riveted the ground wire for the grounding brush back to the motor cover and used a cut off wheel to create a "channel" to slide the positive brush wire in like it was originally but on the other side of the brush plate.

and all done except making a spacer probably out of wood to space the motor out to compensate for the motor being different depth into the housing, I haven't yet installed the new blower motor in the jeep but in my hand, it sounds like a hurricane to match the F134 engine

Thanks again everyone for the help