Most service trucks still rely on relay-based control systems—because they’re familiar, proven, and “good enough.” But what starts as a simple solution quickly becomes a long-term constraint.
Relay-based systems introduce growing complexity as vehicle requirements evolve. Each new function adds more wiring, more components, and more points of failure. What once worked for a basic build becomes difficult to scale, maintain, or troubleshoot.
For OEM engineering teams, this creates real friction:
- More time spent designing and routing wiring
- Increased install complexity on the production line
- Higher risk of integration issues across subsystems
And it doesn’t stop at production. In the field, these systems lack visibility. When something goes wrong, technicians are often left diagnosing issues manually—resulting in longer downtimes and repeat failures. The bigger cost isn’t the system itself—it’s what it prevents:
- Faster builds
- Smarter diagnostics
- Future upgrades
The Shift
Modern service truck architectures move from component-based systems to integrated control systems. Instead of adding more wiring and relays, OEMs are adopting:
- Smart CAN-based controls
- Centralized system architecture
- Built-in diagnostics
This enables simpler builds, faster troubleshooting, and a platform for future capabilities.
Takeaway
Relay systems solve today’s problem. System architecture solves tomorrow’s.
Read more: Better architecture and diagnostics drive better uptime in service trucks.