The 1954 schematic posted previously seems to associate the starter relay with larger trucks? and Buicks?
The reason I posted the 53-55 Corvette schematic was to show that they used a separate starter relay.
The starter relay seems to be only used with corvettes equipped with powerglide trans. that uses a neutral safety switch that is in the starter relay circuit.
I could not find a GMC 55 2nd series schematic.
If you look at the regular 1954 Chevy truck schematic
HERE it does not show the Hydramatic trans. wiring.
The 1954 Chevy truck schematic I posted, shows the Hydramatic trans. wiring, That schematic came from a Motors Service Manual
I have the 55.2 GMC wiring diagram if you need help.
So maybe the 55.2 GMC wiring diagram you have does not show the Hydramatic trans. wiring. also.
Unless you know someone that has a stock 55.2 GMC with a Hydramatic trans.
I know that the 1954 Chevy truck does not have the relay but is has the neutral safety switch.
You are right it does look like the Buicks used the relay, but when I searched the part # 1116855 a couple hits where showing GMC in the listing.
I know that there is high current in the 1954 Chevy truck circuit because they used at least 8 GA wire to the neutral safety switch and to the push to start button and to the solenoid.
