Intake Manifold Heat Strip Wiring Diagram - Temp Switch & Cab Switch Circuit

This is a simple, hand-drawn wiring diagram for an intake manifold heat strip (intake heater) circuit, uploaded to a 1981 Ford Bronco gallery under the filename "Intake heat.jpg." The diagram shows four components: an intake manifold (drawn in outline at the top), a "Heat Strip" element mounted under the manifold runners, a "Temperature Switch" attached to the heat strip assembly, and a "Cab Switch." A battery is drawn at the lower right with (+) and (−) terminals. The circuit path is straightforward: a red wire connects the battery's positive terminal directly to one side of the heat strip; the other side of the circuit runs from the temperature switch, through the cab-mounted switch, and back to the battery's negative terminal. From this document a reader can learn the basic wiring scheme for adding or troubleshooting an intake heat strip: power is fed constantly from the battery positive, while the ground/return side is controlled in series by both a temperature switch (presumably to cut the heater when warm) and a manually operated switch in the cab. No wire gauges, part numbers, fuse ratings, relay, or year/model applicability information is given anywhere in the diagram.