I was installing my in cab heater today

[Deadguy]

It's the 1954 military upgrade. I bought it from Midwest Military, but a few sell it. There is a "regulator", basically a length of ceramic with coil wound over it, and wires sticking out of both ends. Based on where it attached to the heater switch, I think it controls whether the heater runs high or low. it is supposed to have brackets that mount it to the firewall. It didn't have those, I was trying to figure out how to fabricate something, and I broke it. Does anyone have any idea of how I can replace it?

This is it, the red is my guess of what the bracket (that runs through the hollow center) would look like.

[Sam-Helm]

The "regulator" is a wire wound resistor. They are used when heat dissipation is a concern. The ones I have used typically have a slider on them to allow one to adjust the rating. It can be replaced with a rheostat just as easily as the original. Mounting of the resistors can be done with a clamp type bracket around the middle of the resistor (insulated would be a good thing), sort of like a fuse holder. I don't remember the vendor we use, but I will try to remember to look it up when I go to work in the morning.

[wesk]

Go to page 5 of the M38A1 hot water kit instructions TB 9-2855-43. Item "F" at the top of the page is what you broke. It's Ordnance part number is 8710856. Google that part number and you'll get many hits:

http://www.stscorp.net/5905007778491-8710856/32557/

http://www.parttarget.com/5905-00-777-8 ... 10856.html

Here's 10 each for sale on Ebay at Buy it now price $21.50 each + $5.15 shipping.

Or you can shop any on line elctrical discount house using the technical specs for the resistor found right here.
http://www.parttarget.com/5905-00-777-8 ... 10856.html

5905-00-777-8491 (5905007778491) NSN Information
NSN FSC NIIN Item Name INC
5905-00-777-8491 5905 007778491 Resistor, Fixed, Wire Wound, Inductive 37403
5905-00-777-8491 Features
MRC Parameter Characteristics
AAPE Temp Coefficient of Resistance in ppm per deg Celsius -400.0 to 400.0
AAPP Electrical Resistance 5.000 ohms
AAPQ Resistance Tolerance in percent -5.000 to 5.000
AAQZ Inclosure Method Encapsulated
AARB Terminal Type Tab W/wire lead W/tab
AARG Reliability Indicator Not established
ABJT Terminal Length 19.500 inches minimum and 20.500 inches maximum
ABPM Body Diameter 0.660 inches nominal
ADAQ Body Length 4.020 inches nominal
AEFB Power Dissipation Rating in Watts 50.000 free air
CBBL Features Provided Mounting hardware
STYL Style Designator 154 radial terminal each end
5905-00-777-8491 Manufacturing Part Numbers (SKUs)
MFG SKU CAGE ISC RNVC RNCC SADC DAC
8710856 16528 6 2 5
8710856 19207 6 2 3
8710856 28375 6 2 5
8710856 44655 6 2 5
5905-00-777-8491 Manufacturer
MFG SKU CAGE Manufacturer Type Status Role
8710856 16528 Altek Systems Inc. N A
8710856 44655 Heico Ohmite LLC N A
8710856 28375 Spectron Inc. N A
8710856 19207 U S Army Tank Automotive Command N A
5905-00-777-8491 Demilitarization Codes & Management
DML PMIC HMIC ADPEC Criticality ESDC
A N X B
5905-00-777-8491 Miscellaneous Management
MOE (S_A) SOS AAC QUP UI SLC CIIC RC MCC SVC
DA SMS D 1 EA 0 U Z Q22RCX- A
DA SMS D 1 EA 0 U Z Q22RCX- D
DA SMS D 1 EA 0 U Z Q22RCX- F
DA SMS D 1 EA 0 U Z Q22RCX- M
DF SMS D 1 EA 0 U N SF9EH-N A
DF SMS D 1 EA 0 U N SF9EH-N D
DF SMS D 1 EA 0 U N SF9EH-N F
DF SMS D 1 EA 0 U N SF9EH-N M
DM SMS D 1 EA 0 U Z 15B2B-- A
DM SMS D 1 EA 0 U Z 15B2B-- D
DM SMS D 1 EA 0 U Z 15B2B-- F
DM SMS D 1 EA 0 U Z 15B2B-- M
DS SMS D 1 EA 0 U N ------- A
DS SMS D 1 EA 0 U N ------- D
DS SMS D 1 EA 0 U N ------- F
DS SMS D 1 EA 0 U N ------- M

[Deadguy]

Thanks Wes! You're a life saver-I just bought one off ebay.

[wesk]

You are welcome.

All it takes to find 2/3rds of what you are looking for is a wee bit of in house research, the search function of this web site and the good old GOOGLE web site.