CHMSL fuse? (3rd brake light). Does the 3rd brake light work?

 

My truck doesn't have a 3rd brake light.

 

you might want to look at the Data Bus...they sometimes act up due to poor connections..

 

Thanks.
Where would I find this?

 

Make sure emergency brake and brake pedal switchs are working properly.

 

I have a strange issue with my cruise control where if I hit a bump at high speeds hauling trailer it will shut off. I'm thinking its a connection thing with the bus, I would say check all of your connections, there is a harness that sits just above the passenger side fender well that tends to get corroded and damaged due to rubbing on the plastic fender well, might be a good place to start.

 

my brake pedal switch quit working one time and if the switch goes bad it cannot cancel out the cruise so a builtin safety the cruise wont work untill switch is replaced. btw brakes still worked fine

 

With some help, I just checked the brake lights. All is fine there...

 

Stoplamp switch. I don't care of you have any brake lights, the switch has either two or three make/break contact sets. Brake lights only use one. And, since I seen your fancy hitch, now would be a good time to ensure that the brake controller is wired in correctly, per this bulletin:
https://www.google.com/url?sa=t&sou...ed=0CB8QFjAA&usg=AFQjCNER-JasFu8J6KmHqqQuu-VxqXrcUg&sig2=6YcpERs9C_cteWEB0q7xzA

 

Good to know on the 2 /3 contacts. I'll check that out tomorrow.
Where would I find this switch?

The brake controller wiring was fixed when I first bought the truck.

 

It's a same your across the nation...
My Tech2 will tell you if all the inputs to the ECM are working for the cruise...

 

Old thread. I changed out the brake switch, still no cruise control. Brake lights, trailer brake, and exhaust brake all work. So, any other ideas? Maybe a fuse I missed or ??

 

If all other items are working. It may be control arm. I do not know how to check it out.