Note: Always verify with your specific VIN and chassis configuration—Peterbilt used slightly different layouts depending on options.

If you own or drive a 2015 Peterbilt 389, you already know that electrical issues can bring a haul to a halt fast. Whether it’s your headlights, turn signals, HVAC blower, or power ports—knowing exactly which fuse to check is critical.

The 2015 model year uses blade-type fuses (mini and ATO). Always replace with the same amperage.

2015 Peterbilt 389 (all trims)

Here’s a quick guide to understanding the 2015 Peterbilt 389 fuse panel diagram.