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Re: Cab construction question (elec. ground)
The cab is grounded via a braided cable to the engine and to the vehicle frame (the pickup box is also grounded to the frame).
The cab is comprised of separate pieces welded together and with seam sealer, as you have surmised, but because of the welding you have ground as if the cab was fabricated from one solid piece of metal.
Back then ground was achieved by shooting a bolt (with a star washer) through the paint, attaching the braided cable. You can imagine how that works out long term...
These days we use a copper weld stud attached to the sheet metal, which allows for an unpainted surface for continuity but without the corrosion concerns.
K
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