Help With Controls On My Truck Please.

I never got an owners manual and had no luck on the internet, so a little help would be very appreciated. Every time I ask a question on the Facebook prom driver page I get bashed for my ignorance so I'm back among friends. I should never have strayed.

They have me a 2015 international. On the dash is a switch marked pdl it says lock at the top. Also there are 2 buttons by the headlight switch marked auto and work.

What are they for, and when/if should I use them?

Thanks in advance.

I'm in the exact same truck.

The "auto" switch turns your headlights and marker lights on and off dependent on the outside light. I don't ever use it personally.

The "work" switch turns on the lights on the back of your cab. I use them when coupling and uncoupling at night.

The "pdl" switch is Power Differential Lock. It's for low traction conditions at low speeds. When in the locked position, it is similar to a limited slip differential on a car. Basically when the individual dual sets on your drives start to lose grip, it modulates the power to them to try to increase traction

I don't have an international, but I'm guessing by your light switch the "work" setting might be for the utility lights on the back of your cab? Maybe the "auto" is to turn headlights on automatically like cars do?

I don't have to a clue about the pdl thing. Hopefully some international drivers will give you a better answer.

Thanks. I knew I'd get the answers here.

Auto I'll never use as you do not.

I was wondering how to get those coupling lights to work

Thanks again.

No problem! It's definitely easier to get answers over here than on most places online lol. Anytime you have one someone will do their best to give you an answer. Stay safe!

Also the work button is used for pre-trip....With your headlights & flashers turned off press and hold the work lights switch for about 5-7 seconds and when released all of your truck & trailer lights should light up in sequence. Just one walk around the truck/trailer and you can check all lights & signals.

Also the work button is used for pre-trip....With your headlights & flashers turned off press and hold the work lights switch for about 5-7 seconds and when released all of your truck & trailer lights should light up in sequence. Just one walk around the truck/trailer and you can check all lights & signals.

Whaaat?? That's cool, I have to try that today when I get back to my truck.

Also, Paul, a tip about the PDL switch. If you need to use it, make sure you are stopped and your wheels aren't spinning before you switch it on so you don't damage your transmission.

It won't damage the transmission very much to worry about, but it will snap a ring gear on the differentials quick. As stated above, only engage it after completely stopped for at least 3 seconds. Also a good idea to not use it on the pavement. Gravel, mud or snow only.

Had it on my 13 then moved into a 2015 and it didn’t work, until someone told me to hold in a few seconds longer. Can’t tell you how many times I’d turn on a blinker walk to end of the trailer come back turn on the other blinker walk back etc...

Also the work button is used for pre-trip....With your headlights & flashers turned off press and hold the work lights switch for about 5-7 seconds and when released all of your truck & trailer lights should light up in sequence. Just one walk around the truck/trailer and you can check all lights & signals.

Whaaat?? That's cool, I have to try that today when I get back to my truck.

Also, Paul, a tip about the PDL switch. If you need to use it, make sure you are stopped and your wheels aren't spinning before you switch it on so you don't damage your transmission.

Had it on my 13 then moved into a 2015 and it didn’t work, until someone told me to hold in a few seconds longer. Can’t tell you how many times I’d turn on a blinker walk to end of the trailer come back turn on the other blinker walk back etc...

I tried it last night and it works! I like it cuz it checks the brake lights too. Mine doesn't cycle thru all the signals, just flashers, low and high beams, and brakes. Does yours turn on the ABS light on the trailer too? Or is that just because my trlr ABS is busted? Lol