Love those old KB trucks, there's a guy about 50 miles from me that is running around in one of those. Stopped at a gas station one day visiting a friend & I heard this low groan of a diesel & turned around & seen a bright red International KB truck like yours drive by w/a 30ft box trailer behind it..
ALL Brown wires..lol reminds me of the larger later model International Trucks, they used all black wires w/writing on them about 2 inches from each end. Real fun tracing those down when they all have been cut a foot back & the parts are missing makes for a longgggg day..joe