Changed blower resistor pack, still not working
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Joined: Apr 2019
Posts: 182
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From: Woodstock, IL
Changed blower resistor pack, still not working
Only had the high setting that worked before so I replaced the resistor pack along with a new connector. Plugged it in and tested it out and and now switching between all 4 settings its only on low. Made sure all of the wires were spliced the same way as the factory plug. Not sure what is causing this.
Probably a bad "new" resistor block, never trust anything "new" its NEVER been tested, lol
There should be 4 wires connected
Key OFF testing
Connector unplugged
The Black wire is a full time ground, test it with ohm meter, 0 ohms to ground, this is LOW speed
Light green/white wire is med low, turn switch in cab to that setting and test that wire, should be 0 ohms now(high ohms in any other setting)
Yellow/red stripe is med high, same test, turn switch in cab to med high and should see 0 ohms
Orange/black stripe, is high, same test
If you are not getting 0 ohms then the Ground wire for the switch in the cab is unhooked
Speed is done by ground not 12volts
The blower motor gets 12v with key on from fuse 16 and blower relay
The speed control is done by Ground
High, the orange/black strip wire, is a direct ground from cab switch, no resistors, so if high is not working then either fuse is blown or Ground in cab is not connected
Low, med low and med high is done thru the resistor block, and it gets HOT, so its located in the air stream of the blower
The resistor block its just 3 resistor in a row
In Low all 3 resistors are used with direct ground at the resistor block, the black wire, switch is not used in Low
In med low, only 2 resistors are used by switch Ground
In med high, 1 resistor is used by switch ground
In high, no resistor and direct ground from switch to orange/black wire
So if only Low is working either resistor block is bad or cab ground for the switch is
There should be 4 wires connected
Key OFF testing
Connector unplugged
The Black wire is a full time ground, test it with ohm meter, 0 ohms to ground, this is LOW speed
Light green/white wire is med low, turn switch in cab to that setting and test that wire, should be 0 ohms now(high ohms in any other setting)
Yellow/red stripe is med high, same test, turn switch in cab to med high and should see 0 ohms
Orange/black stripe, is high, same test
If you are not getting 0 ohms then the Ground wire for the switch in the cab is unhooked
Speed is done by ground not 12volts
The blower motor gets 12v with key on from fuse 16 and blower relay
The speed control is done by Ground
High, the orange/black strip wire, is a direct ground from cab switch, no resistors, so if high is not working then either fuse is blown or Ground in cab is not connected
Low, med low and med high is done thru the resistor block, and it gets HOT, so its located in the air stream of the blower
The resistor block its just 3 resistor in a row
In Low all 3 resistors are used with direct ground at the resistor block, the black wire, switch is not used in Low
In med low, only 2 resistors are used by switch Ground
In med high, 1 resistor is used by switch ground
In high, no resistor and direct ground from switch to orange/black wire
So if only Low is working either resistor block is bad or cab ground for the switch is
Thread Starter
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Member
Joined: Apr 2019
Posts: 182
Likes: 38
From: Woodstock, IL
Found the problem, the ground wire in the panel connector had pulled out slightly, pushed it back in and now its working as normal. Thanks
RonD, Great explanation... I feel like I learned something tonight !
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