Heater fan upgrade in the NAS D-90???? - Page 3 - Defender Source
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  #41  
Old December 18th, 2012, 11:31 AM
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Well easy way to confirm this resistor business is to hook up a multimeter between chassis ground and the two wires coming from the switch and check the ohms in each position. the low postion should be much higher than the hi position. if so, and you can clip the internal ground on the motor and run a wire out of it, then your in business.
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  #42  
Old December 18th, 2012, 11:31 AM
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Here's a pic of the resistor:
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  #43  
Old December 18th, 2012, 11:33 AM
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Quote:
Originally Posted by nathanwind View Post
Here's a pic of the resistor:
where is that?
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  #44  
Old December 18th, 2012, 11:33 AM
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Quote:
Originally Posted by Overlander View Post
Well easy way to confirm this resistor business is to hook up a multimeter between chassis ground and the two wires coming from the switch and check the ohms in each position. the low postion should be much higher than the hi position. if so, and you can clip the internal ground on the motor and run a wire out of it, then your in business.
I'm confident in the resistor wiring layout, so I think you're right...I'm going to crack open the GM motor and clip the ground and run a new line outside of the motor that I can tie into the existing Rover wiring.

I've been taking pics along the way and plan to do a writeup in the Tech Section once it's all sorted.
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  #45  
Old December 18th, 2012, 11:34 AM
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Quote:
Originally Posted by Overlander View Post
where is that?
Inside of here:
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  #46  
Old December 18th, 2012, 11:38 AM
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Essentially you have 1 ground wire that runs out of the LR blower motor, to the resistor...from there it has 2 possible paths. The first is the green/gray wire which is unimpeded ground (when the switch in the cabin is down in the "bottom" position, which is the high setting). The other path is the green/yellow which is run through the resistor (and is the "first" position on the switch, which is the low setting). When either is closed, current will take the past of least resistance (or in this case, when the switch is closed, the only path since just one will be grounded at any given time).

I'm going to crack the GM motor and bench test this all and see how it goes.
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  #47  
Old December 18th, 2012, 11:41 AM
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God Speed! I have no immediate need for this because anywhere from teens up, I have no issues with heating, as my 110 is well insulated now and will bake me out. My buddies and I are talking about a possible Dempster highway adventure in next couple years, so this might be a nice treat upgrade prior to that.
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  #48  
Old December 18th, 2012, 12:02 PM
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Bingo...internal ground wire:
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  #49  
Old December 18th, 2012, 12:04 PM
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Quote:
Originally Posted by nathanwind View Post
Bingo...internal ground wire:
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  #50  
Old December 18th, 2012, 12:34 PM
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Well that's pretty convenient!
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  #51  
Old December 18th, 2012, 12:36 PM
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fan rotation

Would one of you kind souls tell me which way the fan spins that you are replacing.

Looking down at the motor end which way does the fan spin? Been wanting to replace my U/S motor on my RHD

Thanks
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  #52  
Old December 18th, 2012, 12:42 PM
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Quote:
Originally Posted by roverman2010 View Post
Would one of you kind souls tell me which way the fan spins that you are replacing.

Looking down at the motor end which way does the fan spin? Been wanting to replace my U/S motor on my RHD

Thanks
clockwise i believe...
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  #53  
Old December 18th, 2012, 12:43 PM
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If that doesn't work, reverse the wires.

------ Follow up post added December 18th, 2012 12:44 PM ------

Afterthought: are the blades one directional?
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  #54  
Old December 18th, 2012, 02:11 PM
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Quote:
Originally Posted by Overlander View Post
If that doesn't work, reverse the wires.

------ Follow up post added December 18th, 2012 12:44 PM ------

Afterthought: are the blades one directional?
Blades are directional (curved), and rotate clockwise as you look at the squirrel cage.
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  #55  
Old December 18th, 2012, 02:28 PM
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so does it blow in correct direction as is?
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  #56  
Old December 18th, 2012, 03:31 PM
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Quote:
Originally Posted by Overlander View Post
so does it blow in correct direction as is?
Mine does...I think John was referring to his with the direction question.

So here's an update. Got everything wired up/etc, put back together. Tested on the bench and worked like a charm.

Bolted it back into the truck and....not so much. Even though I "cut" the internal ground wire, once bolted up the blower housing is once again creating a ground and is full-time "on".

Not sure what the heck to do now. Bummer...I was so close! I'll post up a pic of the internal of the GM motor to see if there's anything I may have been missing/overlooked.
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  #57  
Old December 18th, 2012, 03:35 PM
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can you just isolate the motor from the housing with a gasket and maybe some rubber washers or silicone on the screws?
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  #58  
Old December 18th, 2012, 03:37 PM
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can you just isolate the motor from the housing with a gasket and maybe some rubber washers or silicone on the screws?
Already used a homemade rubber/fiber gasket, and used right stuff on the mounting screws...still not doing the trick. Plus that is probably prone to being an issue down the road and if things shift/etc and create ground then it's a huge pain in the arse to take everything back apart.

Back to the relay idea?
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  #59  
Old December 18th, 2012, 03:43 PM
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Here's a step by step taking it apart, and reassembling with the new connector:
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  #60  
Old December 18th, 2012, 03:55 PM
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But relay only solves the on-off, not the multiple speeds, right?
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