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Brake light being on issue has been solved. Id like to thank everyone for all your input and help, i greatly appreciate it. Now onto the resolution... let me be the first to call myself a dummy. Long story short, my 2 and 3yr olds were playing in the cab while i was troubleshooting the...

Recap of things ive done thus far on brake issue. Replaced my front non vented gladhand with a vented a few months ago. (Still not sure why this is needed when the truck operated without issue for a year with a non vented, but did anyways). Pressure sensors checked out good. Removed some of the...

Brake lights are off before 70psi. Once reach 70psi they stay on until system is completely emptied. Im not sure if its a switch bad or a small amount of pressure applied to brakes because the truck isnt locked up, i can still drive and move around yard without it feeling like the brakes are...

Didnt see any sensors that jumped out at me but will take a better look here this afternoon. On the brake issue, my brake lights will come on once pressure is at 70psi. Dummy light and alarm go out at 60psi as should. When i blow down the air system i can hear all brake cylinders backing off...

Grounded "D" wire and buzzer went away... looks like that was my alarm issue. Thanks for putting up with my stupidity HULK. Appreciate your willingness to keep at it with me.

Grounded the temp switch wire when removed from switch and guage jumped so the guage is good and the temp sensor is good. Im back to possible brake issues though. I can see my brake lights on when no brakes applied. It did this when my brakes had locked up on me. Truck still drives however...

No luck with the new temp switch itself, still getting an audible alarm. Need to check the wire itself yet. So far this is what i have: Failsafe module pins: A - engine ignition circuit (power to box, assume if bad it wouldnt work) B - blackout override input ( havent tested) C - not used D -...

Unfortunatly that didnt work, that was the first thing i tried... well a big splitting maul anyways, maybe i need to start carrying a bfh onboard. Im sure the system was in need of a good lube which is what i did and so far think it solved that issue. Fingers crossed. Thanks

Not yet... have a good feeling its the temp sensor as you suggested. Time was a little short (whats new) so ordering a new one to swap in and hope it takes care of issue. Will post what i find out, if not it doesnt hurt to have a spare...

That was actually my next wire snip had i not gotten fooled by the power source. Any idea where the temp sensor was located? Or what this wire goes to? My temp guages all have been normal operating temps. I always rely more on guages than dummy alarms.

Well there was no lights (or sound) because i had cut pin A which unknowingly shut off all power to it as you suggested. It works when pin A is reconnected just alarm does not shut off ( no dummy lights and all dummy lights work properly)... so i would assume ground is good or the module wouldnt...

I believe i have proper function of air and parking... dummy lights go out when should. Your very correct Hulk, didnt have time to fully check but yes my "a" wire powers the whole module, just went out and tried, no lights or buzzers at all. Back to drawing board. Prolly wont have more time for...

Built air pressure on system to above 120 psi, alarm shuts off at 60 psi as should, dummy light also shuts off. Also troubleshot air system per technical manual with no issues present. Parking brake also shuts off when disengaged. The wire is pin A on the failsafe connector which is the engine...

Determined the issue is in the engine ignition circuit somewhere. This would be the buzzer when battery is on and ignition is on before switching fully to crank engine. The buzzer now never goes off. With wire snipped to failsafe module buzzer is silent and other buzzers in module work as...

Well the issue isnt the failsafe module... same issue as old one, air pressure is good, low air light goes off and alarm is still on... keep looking through tm i suppose.

Thanks for help. I ordered a new failsafe box. Found one for 125. Should be here next week. Ill post the results... Take er easy

Checked my air dryer over and that appeared to be ok. Would a bad dryer / dryer valves trigger the alarm if pressure is good? Followed the technical manual for low air alarm with normal pressure on guages. Switches on primary and secondary tanks both showed below 300 ohms when over 90 psi on...

So i have not been having the brake lockup issue recently however i did install a vented gladhand anyways and threw some air oil in the lines. I do have a new issue that had been going on since i bought the truck but never showed signs unless at high speeds (60mph) and never occured more than...

Finally got a little time on the truck yesterday. Looks like i dont have the vented gladhand in the front. No hole on inside of gladhand, appears to fully seal when in place. Ill look into getting a vented. I guess my question on this would be why all of a sudden would a non vented gladhand be...

My service gladhand (pass side) does not have a valve and i believe it is a vented type. I grabbed some air tool oil from work and will try that tomorrow night. I did pull the brake dust covers and it looked good from what i could see. This is a recent issue, driven the truck for a good 800...