Isolation Relay

Thunderbolt Locks Isolation Relay

The Thunderbolt Locks Isolation Relay is designed to seamlessly integrate with even the most complex vehicle locking systems by isolating the factory door lock circuit. This ensures a safe and reliable connection while preventing electrical interference. It is particularly recommended for Mercedes Sprinter front cab doors. For optimal performance, one relay is required per lock.

Installing Thunderbolt ML+ Locks on Sprinter Cab Doors

When installing Thunderbolt ML+ locks on Sprinter cab doors to operate with your factory key fob, we strongly recommend using isolation relays. These relays connect to the factory motor wires to prevent potential issues caused by additional power load on the door lock circuit, ensuring smooth and reliable operation. They also minimize current draw on the factory system. Additionally, the lock inhibitor wires should be connected to power and ground.

Important Notice:

The information provided is based on our recommendations and opinions. We do not provide warranties or guarantees regarding accuracy. Users assume full responsibility for verifying wire identification before installation, as wire colors may vary—even within the same make and model. We strongly advise consulting a professional upfitter. The included diagram may assist with installing isolation relays.