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Blower Motor Resistor Assembly - killed battery - recommended aftermarket manuf?


tbb2's Avatar
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Arlington, VA

January 12th, 2018, 3:44 PM   #1  
Blower Motor Resistor Assembly - killed battery - recommended aftermarket manuf?

I have traced a parasitic draw on my battery to the Blower Motor Resistor Assembly (BMRA).
It pulls power from fuse #51. The draw was 0.07 Amp with fuse 51 in place and 0.004 Amps (4 mA) with 51 removed.

The number on the existing, what looks to be original, part is 12135104.
It is my understanding GMC bought ACDelco so that is their go to supplier.

On the ACDelco site PN 12135104 does not exist.
By a vehicle search I found PN 15-81796 and it has the appearance of the existing.
The dealer is selling a part with wish washy specs supposedly ACDelco for $127.44.

I'm finding other aftermarket manufacturers:
DWD
Dorman
Duralast
AA Ignition
with pricing from $13 up to $68

and $52 for an ACDelco PN#.

Is anyone able to weigh in on aftermarket manufacturers of a BMRA?


Last edited by tbb2; January 12th, 2018 at 3:51 PM. Reason: add info
 
Twscarp's Avatar
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Elyria, OH

January 12th, 2018, 4:49 PM   #2  
Posted By: tbb2 Is anyone able to weigh in on aftermarket manufacturers of a BMRA?
Please, always check RockAuto parts, I have been happy with them.
http://www.rockauto.com/en/catalog/c...+resistor,6557

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tbb2's Avatar
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Posts: 89
Arlington, VA

Yesterday, 2:47 PM   #3  
Blower Motor Resistor Assembly - no short?

I have a parasitic draw on my battery.
I found it going thru fuse 51. I can only find that fuse 51 feeds the HIGH speed of the blower.

I did a desk top continuity test of BMRA and do not see anything I identify as a short. (?)
See Image Below.

I assume that to have a parasitic draw thru the BMRA it would have to have a short in it feeding power to ground.

Anyone see what I am missing?
Could this mean there is a short in the r/blk wire from fuse 51 to the wide connector?

Since the blower motor is feed by the BMRA could it short without the BMRA? ... clutching at straws

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kevinkpk's Avatar
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Yesterday, 3:51 PM   #4  
You might try unplugging the blower motor see what that does.

 
tech2's Avatar
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Posts: 5,505

Yesterday, 9:15 PM   #5  
a short before the load would blow the fuse. there are no other loads on the circuit so replacing the resistor is where i would go.
When it comes to certain parts i would go oem...a blower resistor is not one of them.
a/c delco is not oem for gm. gm is who gm uses for oem...delco is what gm uses for their low cost line of parts.

 
tbb2's Avatar
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Join Date: Feb 2011
Posts: 89
Arlington, VA

Today, 2:07 PM   #6  
Blower Motor Resistor Assembly - recommended aftermarket manuf - ACDelco

Posted By: tech2 a/c delco is not oem for gm. gm is who gm uses for oem...delco is what gm uses for their low cost line of parts.
tech2,

How do you get to that conclusion? See Image Below.

I can understand that for a BMRA OEM is not critical.
I could still benefit from experience on alternate sources.

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StanVan's Avatar
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Posts: 434
Fairfax Virginia

Today, 2:23 PM   #7  
FWIW, Rock Auto has the "OEM" notation next to a lot of AC Delco parts. And on the ones I've checked, the part numbers match up with GMPartsDirect.

 
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