Identify Horn Motors Brands

[mrtexas]

I thought someone might find this interesting. I pulled out the dozen or so core horns I bought a couple years ago. I have 5 Stewart Warners, 3 Spartons, one GMI, one Ames, one 32 and 2 EA labs. I couldn't seem to find all this information in one place on the web so here it is. Some of the information came from "How to Restore Your Model A" volume 1 and "Technically Speaking" volume 3.

Identify Model A Ford Horn Motors
There were 5 kinds of Model A Horns for 1928-1931. Most of the time they can be identified by the brand stamped into the motor base, horn cover, or horn bell. My several horns had mixed up or wrong covers and horn bells as well. They can also be identified by the motor frame width and the armature shaft diameter. These are only the most common types. Several of the brands have some variations I don't show.

GMI
1" frame and 5/16" shaft.
The brush holder is unlike any other brand


Stewart Warner
11/8" frame and 1/4" shaft
Caution: the nut on the end of the armature is a left handed thread


Sparton
3/4" frame and 1/4" shaft


EA
3/4" frame and 1/4" shaft


Ames
11/8" frame and 5/16" shaft


32 Ford
Bullet shaped cover


32 Ford
Note the different hole pattern in the 32 on the left. The 32 Horn sits on a bracket on the fender unlike the Model A which hangs from the headlight bar. If a 32 horn is installed on a Model A, the drain hole for the motor will be on the top rather than the bottom.


http://members.fortunecity.com/pjsauber/Akebia.htm

Some more differences:

Horn bases
From left to right, EA, Sparton, Ames, Stewart Warner and GMI. The GMI is the only one with an oilite bearing on the bottom:



Sounding springs
The one on the left is for Sparton and the other is for Stewart Warner:

Terminal blocks
The one on the left is for EA and the other is Sparton. Sparton goes into the insulator with legs and the EA with a single fold.