Review on 🚗 Enhance Your Vehicle's Performance with Motorcraft DY861 Glow Plug Switch by Todd Look

Bought and installed due to cold weather starting problems. Well that never fixed the problem and I assumed there was something else going on with my truck. I checked today and it's not working, looks like the relay is energized when voltage is applied to the coil but no voltage is applied to the glow plugs. I bought a cigarette lighter voltage reader and a USB charger and it became clear that the glow plugs are not interacting with this relay. I manually jumpered the main relay terminals and the voltage dropped as expected when the glow plugs turned on.