Accessory switch issue

[LeoBlue]

I recently bought the m35 109A3 shop van and at first when I started her the buzzer would go off indicating low air but now it won't and it still works because when I flip it on the gauges all come alive so wondering if anyone has some tips on why this might be

 

[LeoBlue]

I recently bought the m35 109A3 shop van and at first when I started her the buzzer would go off indicating low air but now it won't and it still works because when I flip it on the gauges all come alive so wondering if anyone has some tips on why this might be

And I have emptied the air tanks as is required to prevent water from sitting so there's no air in the tanks yet it still doesn't activate the buzzer

 

[ZiggyO]

Pull your power wire to the buzzer (under the dash) and check for power when acc switch is on and no pressure in tanks-- you should see 24v. If so, your buzzer is bad. If not, look at the pressure switch for the air buzzer-- it may have gone bad. I am thinking if your other stuff is getting energized, your acc switch is not likely the problem.........

I have the pressure switches, buzzers, and even some acc switches available should you need them...... pm me.......

Z

 

[LeoBlue]

 

[LeoBlue]

Mine doesn't seem to have a breaker on the fire wall anywhere but the buzzer and electricity to my whole dash was just fine a couple days ago now it's all not working

 

[fpchief]

Are you saying that now when you flip your switch, there is no power at all? No fuel pump running and no start?

 

[LeoBlue]

Are you saying that now when you flip your switch, there is no power at all? No fuel pump running and no start?

The gauges all turn on and the fuel pump and truck still start but all the dash lights front wheel air engage switch and buzzer won't turn on, it's strange because there's no switch on my firewall as most seem to have and it's temperamental sometimes all the electrical works in my truck other times it won't

 

[glcaines]

It's time to do some electrical troubleshooting. Get a VOM if you don't have one and start following the circuits. Start with a circuit that doesn't have power and trace it back to where you do have power. That is where your problem will be. I've attached an electrical schematic.

 

[LeoBlue]

It's time to do some electrical troubleshooting. Get a VOM if you don't have one and start following the circuits. Start with a circuit that doesn't have power and trace it back to where you do have power. That is where your problem will be. I've attached an electrical schematic.

 

[LeoBlue]

Thanks man, I appreciate all the help everyone has been on here it's a great community and I'm glad to be a part of it