Changing the spark plug wires in your 1940 Ford pickup truck is not that different from changing the plugs in a Ford pickup today. In fact, it is easier because you do not have all of the electrical wires, hoses and connections that you have on today's models. The stock engine in your 1940 Ford pickup truck was a V-8, which means there are four spark plugs located on each side of your engine block. These spark plugs are attached to a single distributor cap.
Tools Used: Wrench
Change Plug Wires
Raise the hood on your 1940 Ford pickup and prop it open. Disconnect the negative battery cable with your wrench by turning the fastening bolt to the left. Lift the cable off the negative post.
Pull the first spark plug wire off the spark plug on the passenger's side of the engine block. Trace the wire to the distributor and pull it off.
Snap one end of the replacement plug wire onto the top of your 1940 Ford pickup's distributor cap. Plug the other end of the new wire onto the spark plug where you removed the old wire. Continue this process, plug by plug, until you have switched out all four spark plug wires on the passenger's side of the engine block. Repeat the process to replace the spark plugs on the driver's side of the engine block.
Reconnect the negative battery cable once you have changed out all the spark plug wires on the driver's side of the engine block.
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