WTB: Heater Motor Resistor Part# 8710856

dayboy42 · Post by **dayboy42** » Mon Oct 22, 2018 3:20 pm

I am in search of the resistor for the coolant heater blower. Most people recognize them from the M151 Hot Water Personal Heater Kits. They were used in all of the coolant heater kits though.

Part# 8710856
NSN 5905-00-777-8491

Typically Marked: 8710856 50 10% MEMCOR 8531 (sometimes 8217)

Wire wound fixed
50 watts
5 ohms
10% tolerance

Thank you for your help! - Matt

Post by **wesk** » Mon Oct 22, 2018 9:55 pm

Installation Bulletin for the M38 hot water heater Kit

http://willysmjeeps.com/v2/modules.php? ... _album.php

Parts list for M38 Hot water heater kit

Installation of the resistor

Resistor is item J.

Resistor is item H.

Wiring

RICKG · Post by **RICKG** » Tue Oct 23, 2018 1:53 pm

https://assets.alliedelec.com/f_auto,c_ ... 022806.jpg

Google OHMITE L50J5R0

50 WATTS
5 OHMS

It's what I used, they're around 20 bucks.
I think I have a spare if you don't find one.

45auto · Post by **45auto** » Tue Oct 23, 2018 5:35 pm

Outstanding detective work RickG!!! I looked around on the site and found the mounting brackets also. Several places sale both and prices varied also.

dayboy42 · Post by **dayboy42** » Tue Oct 23, 2018 6:37 pm

Thanks Rick! That will work perfectly. Always plenty of research when your wrenching on these old girls.

Have a great week.

~ Matt

RICKG · Post by **RICKG** » Tue Oct 23, 2018 6:41 pm

Thanks for the shout Harold, much appreciated, Proof a blind squirrel finds a nut now and then.

Matt, I do have the resistor (no brackets) as a spare i'll never use if you're interested. I have pic of my mount here..

dayboy42 · Post by **dayboy42** » Thu Oct 25, 2018 3:14 pm

Thanks for the offer Rick but I found one on eBay really quick and cheap. Looks liked you introduced a relay into the system?

~ Matt

bluewatersailor · Post by **bluewatersailor** » Fri Oct 26, 2018 8:26 am

That resistor gets HOT. The bare metal clips shown in Dayboy 42's first post photo are correct. I believe that a plastic or rubber-covered clamp as show in the last photo would deteriorate quickly and pose a safety issue. Just sayin'.

RICKG · Post by **RICKG** » Fri Oct 26, 2018 9:37 am

Hi David, I worried about that at first and watched it carefully-yes it was hot, uncomfortably hot to the touch but in 5 years time the rubber has not degraded. However I rarely use the low speed setting.

Matt, the relay you see below the resister is my turn signal flasher.

dpcd67 · Post by **dpcd67** » Sat Oct 27, 2018 4:00 pm

Yes they get very hot; I see them all the time on that big on line auction site.
I got one for the one that burned out on my M37 with the Hunter kit installed under the dash.
Or you can just run it on high all the time.

4x4M38 · Post by **4x4M38** » Mon Nov 05, 2018 7:13 am

Related post:

http://www.willysmjeeps.com/v2/modules. ... t=resistor