155-7042 / 176810-0050 Wiper Relay Controller for Caterpillar 320B 320C 320D 320E

Common Symptoms That May Require Wiper Relay Controller Inspection

Wiper does not work: the cab wiper does not respond when the switch is operated.

Intermittent wiper operation: the wiper works sometimes but stops during vibration or cab movement.

Incorrect wiper speed or timing: the wiper speed or intermittent function does not operate as expected.

Connector or relay faults: loose pins, corrosion, water ingress or poor contact may interrupt the control circuit.

Related electrical issues: fuse, switch, ground or harness problems can imitate controller failure.

Fitment Check Before Ordering

Before ordering this 155-7042 / 176810-0050 Caterpillar wiper relay controller, compare it with your original unit. Important confirmation points include part number, connector layout, pin count, housing shape, mounting position, voltage and machine serial number.

For faster confirmation, please send photos of the original controller label, front and rear views, connector side, mounting position and machine model plate. This helps reduce wrong orders and confirms whether the controller matches your Caterpillar 320-series excavator.

Installation and Maintenance Notes

Disconnect machine power before removing or installing the wiper relay controller.

Check the wiper fuse, switch, ground and harness before replacing the controller.

Do not pull directly on the wires. Release connector locks before unplugging.

Inspect the connector for bent pins, corrosion, water ingress and loose terminals.

After installation, test wiper on/off operation, speed control and intermittent function before returning the machine to work.

Ordering Information

Topvelsun supplies controllers, relay modules, monitor panels, sensors, wiring harnesses and cab electrical components for Caterpillar, Komatsu, Hitachi, Hyundai, Kobelco, Volvo and other heavy equipment brands. For this 155-7042 / 176810-0050 wiper relay controller, please provide your machine model, serial number, original part number and connector photos before quotation.

FAQ

What is 155-7042 / 176810-0050 used for?

155-7042 / 176810-0050 is listed as a wiper relay controller reference for Caterpillar 320-series excavator cab wiper control applications. Final fitment should be verified by the original part number and connector layout.

Can this controller be confirmed by machine model only?

No. Cab electrical relay controllers may vary by serial number, connector layout, voltage and machine configuration. Photos of the original controller are recommended before ordering.

Should I check the fuse and switch before replacing it?

Yes. Wiper fuse, switch, ground circuit and harness connector should be checked first because these issues can imitate relay controller failure.

What photos should I send for confirmation?

Please send photos of the original controller label, connector side, front and rear housing, mounting position and machine model plate.