1950 m38 project

jeepjay · Post by **jeepjay** » Sun Jan 13, 2013 5:20 pm

all of the gauges have the correct numbers per wes's diagram except the fuel gauge which has AL EO 11222 down at the bottom, the other number is the same. Jay

Post by **wesk** » Sun Jan 13, 2013 5:39 pm

What is a pipe?

The externally mounted resistor was only used on early thru MC17855 on the water temp, oil press and gas gauges.

Both parts manual list the gauge assemblies with external resistors as:

fuel: 7728852 / 1517270
oil: 7728853 / 1507491
water: 7728855 / 1512244

And the 1955 parts manual list fuel & oil all as, " with clamp and resistor assy", but we all know that is a typo since early has the external resistor and late does not since the resistance is added inside the gauge which necessitated a new gauge PN from AC. Oddly enough the parts manual does separate the early vs late water temp gauges but again they show the same nomenclature which is not correct for the late gauge. :

with external resistor:

fuel: Blank / 1517270
oil: Blank / 1507491
water: 7728855 / 1512244

With internal resistor:

fuel: 7728852 / 1517561
oil: 7728853 / 1507680
water: 7389567 / 1512422

This will be much more obvious if you review the other M series truck parts manual of the period IE G741 (M37) and G742 (M35)

The AC numbers at the bottom of the gauge face will differ between early external resistor gauges and later internal resistor gauges.

Post by **wesk** » Sun Jan 13, 2013 5:51 pm

Jay,

This is why it can be very misleading to go wholly on parts list. The Army procurement system used the Ordnance parts numbers very liberally. One ordnance part number could often represent tow or three different manufacturer's parts and and even occasionally one manufacturer's two or three different numbers as well.

For some reason the Army left the ordnance part number unchanged on the evolving fuel and oil press gauges but they actually changed the Ordnance part number on the water temp gauge.

Often the Army will allow very different parts to use the same ordnance number so long as they either spec out the same or at least can function with at most a slight field modification. Thus when the external resistors were dropped the Army saw no need to change the ordnance # since by simply deleting the external resistor in the early cluster the late gauge can be used.

So in real life the fuel and oil pressure gauges will display the same Ordnance # for both early (external resistor) and late (internal resistor) gauges but on the lower face of the early gauge will be the early AC#. The water temp however will show differing numbers top and bottom.

I believe that fuel gauge you have is from a 55 or newer M series application.

Post by **Ryan_Miller** » Sun Jan 13, 2013 7:16 pm

The resistor housing coming out of the back of the early guages on external reisistor guauges has a "pipe" appearance. Like a tobacco pipe.

jeepjay · Post by **jeepjay** » Fri Jan 18, 2013 5:09 pm

I added some pictures of some of the body repair into my photo gallery

Post by **Ryan_Miller** » Fri Jan 18, 2013 7:59 pm

Looking good!

alexandrewillys51 · Post by **alexandrewillys51** » Sun Oct 30, 2016 1:25 pm

Hello,

I need to buy WO-801469 part (plug acessory firewall), but I have done research and can not find in any online store.

Can you tell me where to find?
I live in BRAZIL, and would like a store that could send me by mail.

I appreciate all the help.

Alexandre

wesk wrote:

4x4M38 · Post by **4x4M38** » Sun Oct 30, 2016 2:12 pm

Alexandre,
I have found what may be a suitable part from a couple
of sellers on EBay. If you type in the part number you will
come up with a couple. One includes the dust cover, and both
I've found come with a Packard connector which must be replaced
for an OEM M38, no no difficult task.

I have not tried the common suppliers here. They may carry them.

I'm just letting you know what I've found using the part numbers
from the Ord 9 G740.

Take care,

4x4M38 · Post by **4x4M38** » Sun Oct 30, 2016 2:16 pm

Here is one:
http://m.ebay.com/itm/LEAD-ELECTRICAL-M ... ING_ACTIVE

4x4M38 · Post by **4x4M38** » Sun Oct 30, 2016 2:18 pm

Here is another:
http://m.ebay.com/itm/Yesco-7363002-Ele ... ING_ACTIVE

The assembly number does not match the Ord 9 assembly,
but the part number for the firewall connector is correct.

alexandrewillys51 · Post by **alexandrewillys51** » Sun Oct 30, 2016 4:39 pm

Brian,

Thank you for your valuable information !!!
I never find the part without your information.

I wonder how it was done to link this piece in electric Jeep system, and what the purpose of this piece? For it was used? What kind of accessory was on it?

Thanks again.

Alexandre

4x4M38 wrote:Here is another:
http://m.ebay.com/itm/Yesco-7363002-Ele ... ING_ACTIVE

The assembly number does not match the Ord 9 assembly,
but the part number for the firewall connector is correct.

4x4M38 · Post by **4x4M38** » Sun Oct 30, 2016 6:33 pm

Hello Andre,
It was powered by the unused third breaker on the cowl
battery box. If I remember correctly some have noted
it would have powered a later installed personnel heater?

Maybe someone else can confirm.

I'm curious as to the OEM orientation with the plug facing the
engine bay or interior. The photo above shows the plug facing aft.
The power lead would have to come back into the interior to
connect with the breaker.

Take care,

Post by **wesk** » Sun Oct 30, 2016 7:06 pm

The receptacle's using side would be inside the jeep. It was meant as a hookup for portable electrical units that the Army may have elected to use in the vehicle.

dayboy42 · Post by **dayboy42** » Sun Nov 20, 2016 2:45 pm

This is the cheapest that I have seen them lately.

http://www.ebay.com/itm/LEAD-ELECTRICAL ... UA&vxp=mtr

What type of male end connector goes into the receptacle

~ Matt

Post by **wesk** » Sun Nov 20, 2016 5:47 pm

That is a much later version designed for Packard rubber connectors

I'll have to look around for a mating plug PN.