Correct switch says Delco-Remy on the side if it does not say anything it is usually the Cole-Hersee version. ARK LES made a lot of switches, however it is not the correct switch,
Incorrect.
Just because the switch is not marked with the Delco Remy logo on the side, does not mean it is "not correct".
As a matter of fact I have seen a lot of Delco Remy marked switches that were not correct for the AD trucks.
Here is a correct NOS AD truck switch in the original GM box that does not sport the Delco Remy or the Ark-less logo.
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The actual "correct" switch depended on the heating system installed and the switches varied depending on if the truck was ordered with a heater and it was installed by the factory , or if the dealer installed the heater with a dealer packaged heater.
Things get even more foggy if you take into account the replacement GM switches or separate defroster units that were sold by the GM parts department.
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