WIKI - RADIO SUPPRESSION

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15.0 Radio Suppression

A radio outlet box on the passenger side of the body was incorporated sometime after July and before October 1943 as documented in factory photographs*.

Bonding straps: Points where bonding to body sheet metal occurs were tinned with solder and left unpainted. The shape of the unpainted areas varies, but the two bond points at the forward edge of the hood are square. The rest of the unpainted bond points are often round or irregular. The following is a partial list of tinned areas on the GPW body:

Hood front, 2 places (square)
Left Fender, shielded wiring harness ground position
Left fender, Bottom bolt holes (to body tub side panel)
Firewall, all grounding stud positions

Suppression condensers: Early vehicles included voltage regulator and generator. Later vehicles (‘44-’45) added Ignition switch., ignition coil, radio terminal box and starting motor.

* According to “Ord dept report” in AAW#2, P223, the terminal box was introduced 3/12/43.

Updates to this info below this line

Note:Ford GPW:
1. SCREW, rd-hd, machine, 1/4-20NC-2 x 7/16.
2. Washer (Incorrectly, the SNL does not list this item for the GPW) It is the same washer as the WO-5121, O.D 3/4 inch and is the same as used on the bonnet clips).
3. Body side wall.
4. FM-351274-S7 Washer, lock, internal-external, s., 1/4 inch. This ensures the bonding of the radio terminal box to the tub.
5. Side wall of radio terminal box.
6. FM-351274-S7 Washer, lock, internal-external, s., 1/4 inch.
7. FM-33795-S7 NUT, hex 1/4-20NC-2.
For the Ford GPW, I listed item 6 to be FM-351274-S7 Washer, lock, internal-external, s., 1/4 inch., however, this was the arrangement as found on a Dec 1943 ACM type 1 tub. Perhaps early days for the installer, as there was no washer (FM-351274-S7 Washer, lock, internal-external, s., 1/4 inch.) installed between the body side wall and the side wall of the radio terminal box.
The ACM type 2 1944 GPWs that I have inspected, have used either the standard split washer in this location, as per the SNL, or missing the split washers altogether and some have had a mixture of the flat 3/4 inch washer on one of the four screws with split washers on the other three - I guess whatever was left in the hand. If I was restoring a 1944 GPW and did not have the original hardware, I woud use the standard split washers at this location. Maurice Johnson 7May04

Note: Composite bodied GPW's has rectangular shaped tinned areas, the edges appear as masked off with 1" tape.

15.1 Radio Suppression Filterette

GPW's produced before 1944 incorporated a "Filterette" assembly mounted on teh firewall, under the dashboard. This consisted of several large capacitors in a steel housing whose purpose was to bypass radio frequencies occuring in the low voltage electrical system to ground. Several styles of filterette s were used in GPW's, three are illustrated below.

1/. Ford GPW-18960 w/2 slotted hex. screws (S7) retaining cover. Mfg. Sprague w/Ford tag. These have been found in vehicles produced in Summer of 1942.

2/. Tobe-Deutschmann 1107DE w/deep draw cover stamped "TOBE" with manufacturers info stamped near bottom. Cover retained by one slotted S7 finished hex. screw.

3/. Tobe-Deutschmann 1107DEG, similar to above w/o large logo and electrical specs on cover. This was parnumber GPW-18960-B.

4/. Tobe-Deutschmann 1107G (not shown) with friction cover and brass etched tag. Seen on 4/42 vehicles.

G503.com GPW Judging Standard WIKI - RADIO SUPPRESSION

15.0 Radio Suppression

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15.1 Radio Suppression Filterette