Is the wiper motor and delay switch the same?
Based on this search of the parts numbers, I can reasonably infer that the wiper linkage is the same, only the motor, wiring, and switch are different. The delay switch mounts in the same place as the non-delay switch, the wiper motor mounts identically, and you need to connect a few new wires between the switch and the wiper motor.
When did delay wipers come out for Chevy trucks?
A similar situation is what happened on my 1975 Suburban. Delay wipers were not available in any of the Chevy or GMC trucks until 1978, and in that year they did a slight redesign of the dash and they changed the wiring around a bit.
How can I add delay wipers to my car?
Add A Factory Option Your first and best choice is to see if your year and model vehicle had delay wipers as an option. If so, figure out what the differences are by going through the factory manuals, and hunt the junkyards, parts stores, or even the dealer for the right parts to make the conversion.
Why are my wipers not in Park position?
The big problem here is the wiring – the colors of all the wires change a good bit with the introduction of the new dash design and the wiring at the wiper motor is a bit different as well. In particular, the later model wiper motors expose an extra connection for the switch that trips when the wipers are in the “park” position.
What happens when you turn off delay wipers?
When the trigger wire does not have power, the relay is closed at the park circuit gets power so it can park the wiper blades. That means that when you turn off the wipers or the delay feature is in the “off” period between sweeps, the relay is not powered and that allows the park circuit to get power.
A similar situation is what happened on my 1975 Suburban. Delay wipers were not available in any of the Chevy or GMC trucks until 1978, and in that year they did a slight redesign of the dash and they changed the wiring around a bit.
How to change a delay wiper on a 1974 Buick?
The wiring diagram from the 1974 Buick Shop Manual is below, with the separate delay wiper harness indicated in red. Once I collect the three “delay wiper only” pieces (motor, switch, harness) the changeover is as simple as replacing the motor and switch with the delay pieces, and hooking up the new wiring harness between them.
The big problem here is the wiring – the colors of all the wires change a good bit with the introduction of the new dash design and the wiring at the wiper motor is a bit different as well. In particular, the later model wiper motors expose an extra connection for the switch that trips when the wipers are in the “park” position.