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Intermittent Wiper Module - 67-72 C/K

Intermittent Wiper Module - 67-72 C/K

$108.00
$120.00 $108.00
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  • Three intermittent settings, plus stock Lo/Hi/Wash
  • Factory-style switch and detents
  • Installs in about an hour with basic tools
  • Fully reversible — uses stock harness and wiper motor
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Factory-style switch, with delay added

This module replaces your factory wiper switch on your 67-72 C/K truck with one that looks and feels identical, but adds three intermittent delay settings to the existing two-speed operation. A microcontroller handles the timing and drives the original wiper motor through the original wiring.

Uses the factory wiring harness
No wiper motor swap
Maintains stock dash appearance
No hidden relay box
A close-up of a person's hand installing or adjusting a small metal component on a blue-gray vehicle interior panel near the windshield.

What Comes in the Box

  • Switch Module

    Our module replaces the stock switch and takes care of switching logic/timing.

  • Power/Ground Pigtail

    Two-wire pigtail for power and ground, along with terminals.

  • Adapter

    Adapter to the stock bezel and knob. Also includes an allen key for the set screw.

  • Printed Install Instructions

    Also available for download here.

    Install Instructions 

Specifications

Operating voltage

10−16VDC

Nominal 12V. Fused and reverse-polarity protected. Handles transients up to 40V.

Switching capacity

50AContinuous

60V N-channel MOSFETs with 21mΩ on-resistance.

Operating temperature

−40/85°C

Quality components made to withstand operating temps between -40 and 185°F

The module's custom PCB runs off the truck's 12V supply, regulated down to 5V for an 8-bit microcontroller that handles the timing logic. Reverse-polarity and transient protection sit ahead of the regulator, so a backwards jump-start or a load dump doesn't reach the rest of the board.

The three intermittent delay settings sit between Off and the stock Low and High detents in the sweep. Three 60V/50A N-channel MOSFETs handle the output to the wiper motor. The switch connector mates directly with the factory harness using Packard 56-series terminals.

Microcontroller · 8-bit AVR Fuse · 1.1A PTC, resettable PCB · 4-layer ENIG, 2µ" gold Delay range · 5 to 14 sec Harness Connector · Packard 56 Terminals Power Connector · Molex Mini Fit Jr Wire · 18 AWG TXL Enclosure · Aluminum, PET-GF Design & Assembly · Lexington, KY

Installation

The job takes about an hour and uses basic hand tools. It requires crimping leads to the supplied pigtail, connecting to a switched 12V source and ground, and installing the new module in the factory location.

The dash cluster doesn't strictly need to come out, but pulling it makes the work easier and gives a clear view of the harness to verify the wiper motor is wired correctly.

Tools needed Wire strippers/crimpers, screwdrivers, and zip ties/harness tape.
Download install guide (PDF)

FAQs

Can I use my stock dash knob?

Yes! The kit comes with a spacer that adapts our switch to the stock style knob and bezel.

How much wiring is involved?

The switch side plugs into the factory harness with no modifications. The only "wiring" you'll have to do is crimping the supplied leads to the pigtail, and connecting them to a switched 12v source and chassis ground. The install guide shows a convenient terminal to tap at the fuse box.

What if I want to go back to stock?

Just unplug the module and disconnect the pigtail. Swap back in a stock switch and you're good to go.

Will this work with an aftermarket wiper motor?

This switch is designed to work with the original GM style wiper motor which uses a 12v constant, switched ground system. If you're using a 3- or 4-terminal GM wiper motor made for another vehicle of this era, you're fine.

If you've replaced your motor with an aftermarket, more modern style of motor, this module will not work. Most modern motors are the typical constant ground with 12v supplied selectively. If you have questions, feel free to reach out.

How do I reset the module?

There's a reset button inside the module, accessible through the back of the housing. Push a pencil or other nonconductive tool through the hole, press and hold for 3-5 seconds, then release. The LED will blink rapidly to confirm the reset.

What's the warranty?

Two years from date of purchase. For issues after that, please reach out. We can usually fix it for the cost of shipping.

Installation and operation are at the owner's risk. Dwell Circuit Co. is not responsible for damage to the vehicle or wiper system, or for injury resulting from improper installation or use.