Reliable High-Current Controlfor power windows and door locks
Custom wiring done right. Adding relays can become a complicated and messy project. That’s where MGI steps in — our fused relay boxes provide centralized control and protection with minimal wiring involved.
Wiring is made easy. Each relay box comes with a red main feeder cable and labeled screw terminals. Use the Installation Manual and wiring diagrams to help connect your power windows and locks. It’s that easy.
Quality is Guaranteed. Our relay boxes are routinely tested, with relays rated 40A at 12 volts. You get premium parts only, including an aluminum frame pre-wired with high-temperature GXL.
Relay Box Wiring Diagramshow to install power windows and locks with relays
Window & Lock Switches
Connect your window switches and main power to the appropriate screw terminals on the relay box. Repeat for power locks.
Connect to Motors
Connect your power window motors and lock actuators to the appropriate screw terminals on the relay box. Connect the black ground wire (with red ring terminal) to the auto chassis.
WHAT’S INCLUDEDwhat comes with every power window / door relay kit
- Aluminum frame and 6 built-in relays
- 40 AMP rating
- 5-pin SPDT style allows for reverse motor operation
- Relay-corresponding LEDs for visual troubleshooting
- When relay closes, LED turns on
- Integrated LED blade fuses (+ spares)
- ATC / ATO style blade fuse with LED light that glows when blown
- 5A LED control circuit fuse (+ spare)
FREQUENTLY ASKED QUESTIONSAnswers to Popular questions
Why buy a relay box for power windows?
It’s all about custom wiring done right — power windows and power locks need pairs of relays to operate properly, which can be a real hassle with stand-alone relays. Our power window relay boxes make wiring easy, convenient and centralized, with added features such as built-in fuses and LEDs indicating relay power.
Can this relay box operate “normally closed” devices?
Yes! Power windows and doors need pairs of N.C. 5-pin relays for reverse motor operation. Our unique SPDT Bosch style relay boxes are specifically designed to connect power windows and locks. All you need to do is connect your switches and power windows / locks to the appropriate screw terminals. See the wiring diagrams for more information.