Order filters for two different furnaces, 4 inches thick. Both are 3 1/2 inches but the cardboard en closer had 4 inches printed on it. They flop around in the furnace compartment. You get/don't get what you pay for.
Tip for consumers: Consider that you will get an undersized product.
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My question was how the control box works with only a wire for the running lights and one for each turn signal. The box isn't really a voltage regulator but a switching circuit. The break light voltage input makes the output to the turn signals a constant on. Years ago I installed an extra break light and separate wire because the switching box the dealer sold me kept burning out. Didn't have a brand name on it.
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