Deuce brake light issues

[LOKI85]

I have a issue with my truck it's a M35A2. I have turn lights running lights but no break lights.

 

[porkysplace]

Probably the brake light switch.

 

[swbradley1]

You know where it is correct?

The manual.

 

[gimpyrobb]

Is your 3 lever switch's top switch all the way to the right?

 

[porkysplace]

You know where it is correct?

The manual.

 

[kcollum]

Try taking a jumper cable across the brake light switch on the master or by the air-pack and see it the lights come on. If they work then the switch maybe bad. My switch is a little out of sorts so I ran two wires up to the gear shift and place a toggle switch there to manual activate it for now.

 

[fsearls92]

I just fixed mine last weekend an it was the switch on the air pack. It's simple and a cheap place to start.

 

[LOKI85]

Not shore where it switch is its under the truck rite.

 

[porkysplace]

The switch is on the master cylinder/airpack . I hope you know where the master cylinder is , you should be checking the fluid with the daily pre-trip inspection . It is a single circut brake system , if it gets low on fluid or develops a leak you lose all your brakes .

Download and read these ; GTA-9-1-1851-8.pdf It will assist you with location and name of parts
TM9-2320-209-10-1.pdf basic operation manual should be read before operating a M35
TM9-2320-209-10-2.pdf
TM9-2320-209-10-2 Scheduled Maintenance Operator level M35 Multifuel.

TM9-2320-209-10-3.pdf
TM9-2320-209-10-3 Troubleshooting Operator level M35 Multifuel.

TM9-2320-209-10-4.pdf
TM9-2320-209-10-4 Maintenance Operator Level M35 Multifuel.

More in depth repair
TM9-2320-209-20-1.pdf
TM9-2320-209-20-1 Scheduled maintenance organizational level M44 series 2-1/2 ton trucks.

TM9-2320-209-20-2-1.pdf
TM9-2320-209-20-2-1 Organization level - Troubleshooting Multifuel M35 Part 1 of 2.

TM9-2320-209-20-2-2.pdf
TM9-2320-209-20-2-2 Organization level - Troubleshooting Multifuel M35 Part 2 of 2.

TM9-2320-209-20-3-1.pdf
TM9-2320-209-20-3-1 Organization level - Maintenance M35 Multifuel Part 1 of 4.

TM9-2320-209-20-3-2.pdf
TM9-2320-209-20-3-2 Organization level - Maintenance M35 Multifuel Part 2 of 4.

TM9-2320-209-20-3-3.pdf
TM9-2320-209-20-3-3 Organization level - Maintenance M35 Multifuel Part 3 of 4.

TM9-2320-209-20-3-4.pdf
TM9-2320-209-20-3-4 Organization level - Maintenance M35 Multifuel Part 4 of 4.

TM9-2320-209-20P.pdf
TM9-2320-209-20P Organization level - Maintenance M35 Multifuel repair parts and special tools
The -20P is parts manual and has drawings of the parts.

 

[197thhhc]

PM me if you need a brake switch. I have them.

 

[TMNT]

I've been on the phone with Loki this evening and I think we've got him sorted out. I'm almost certain it's the air operated brake light switch. His truck looks like it was already upgraded.

 

[bones1]

I already have the air switch upgrade and have no brake lights. Does the truck have to be running, with air pressure before the lights will work since the retro switch is in the airline now?.

 

[steelandcanvas]

I don't think it needs to be running, but I do know you need air in the system for it to operate.

 

[bones1]

That's what I thought as well. I didn't know the air switch was on there until last night. I switched out the tail lights with the new led models but have been looking for brake lights with no air pressure in the system. I'll air it up and see if they come on tonight, I bet they do...................

 

[steelandcanvas]

I'll air it up and see if they come on tonight, I bet they do...................

If not, we'll get the Steel Soldiers Troubleshooting Department all over it. Best of luck!

 

[bones1]

10-4. Thank you sir.

 

[deathrowdave]

Needs air Pressure to operate new style air switch!! Just short between the two wires at the switch no matter witch type you have and they should light . Also the 3 lever switch must be have power to lights on . Test with a test light to see if you have power at the brake light switch , if so short between the 2 terminals and it should light the brake lights . If it does not remove the tail light lens and check for current at the bulb contacts while the brake switch remains shorted, if you have current there then you need new bulbs !! Good luck and have a great and safe day, Dave

 

[porkysplace]

Needs air Pressure to operate new style air switch!! Just short between the two wires at the switch no matter witch type you have and they should light . Also the 3 lever switch must be have power to lights on . Test with a test light to see if you have power at the brake light switch , if so short between the 2 terminals and it should light the brake lights . If it does not remove the tail light lens and check for current at the bulb contacts while the brake switch remains shorted, if you have current there then you need new bulbs !! Good luck and have a great and safe day, Dave

Also clean and check the grounds

 

[bones1]

Thanks for the tips sir.

 

[RangerBob]

The Definitive Answer...

I assume the OP has long since resolved his issue, but since the thread goes on, here is what I will be using to troubleshoot my brake lights ('stoplights' in TM-speak).