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Testing and finished With everything hooked up and secured, it came time to test under working conditions. I started the truck and pumped up a full supply of air, ensured the three-lever switch was set to at least “STOP LIGHT” and shifted into reverse. I could hear the alarm engage. I shut...

Wiring and plumbing The light and alarm was connected together using a rubber shell “Y” adapter. I took a 20’ length of Prestolite 16AWG wire and crimped on a female Packard/rubber shell connector. This wire lead was connected to single side of the “Y” adapter. I carefully fished the wire...

Mounting the Light and Alarm The reverse light was mounted using two #10 ¾” machine screws with nuts and lock washers. You can see in the picture that the bulb is facing down. I then assembled the whole light, including lens, bezel and gasket, using the supplied machine screws. I mounted...

Prep work I crimped female Packard/rubber shell connectors to the positive lead and crimped a large ring connector to ground on the back-up alarm. I changed the male Packard/rubber shell connector on the reverse light to female as I planned to use a Rubber Shell "Y" Connector in order to...

This modification should cover most M809-series trucks. My state does not require these appliances on my truck, but always wanting to keep safety paramount, I thought a reversing light and alarm would be a good idea to install. Last October I rebuilt my transfer case declutch cylinder...