Today I began filling the un-used holes in the firewall of my 1937 GMC. There are several holes that I am unsure of originality or purpose. Any help would be appreciated.
Here is a picture of my firewall. https://photos.app.goo.gl/wJ4yx6C5ZkPFAYvu6
In the photo I have numbered the holes and below I've listed is what I think the hole is for. If anyone has information on this firewall please let me know.
Hole #1 is for GMC only hood props.
Hole #2 and 2a I think are added by prior owner. Maybe for a voltage regulator and wiring harness?
Hole #3 is for vacuum line to wipers?
Hole #4, and 5 unknown.
Hole #6 is for coil wire.
Holes 6a are original and unknown purpose.
Hole #7 is for the Canadian VIN plate
Holes #8 original but unknown use.
Hole #9 Original. Is this for wiring from starter to Amp gauge and on to electrical system?
Hole #10 Looks original but no idea what it could be for.
Please let me know what these holes are for.
Also does anyone know where the original voltage regulator mounted? How is the wiring harness for the headlights and generator routed from the cab to the engine compartment?
Thanks for your help,