HWH levelers

[win21llc]

Levelers not turning on, cannot seem to find whatever sends ground to control center, if I ground that wire the system works, looked behind parking brake pull i do not see anything ! I have 3 psi switches in generator bay, 2 are for brake lights is 3 rd one for levelers ? They seem to be 12 volts ! Jumping 2 of them turn on brake lights, jumping 3rd does not set levelers !

Chuck Payne
1994 WB40

[mose]

The two parallel brake light switches are for the front and rear brake circuits. I believe the 3rd one is to initiate the brake activated retarder, assuming you have a retarder.

There's also a pressure switch on the parking brake circuit that only enable the hi-idle when parked.

As for the HWH, I don't recall the GND being switched, such as for a parking brake enable as you were alluding. On my '91 I believe that GND is just GND. I can drive off with the panel still retracting the jacks. It just has a buzzer to let you know if any jacks are not fully retracted. Don't know if yours is similar.

[Dave Stokes]

Which system do you have? HWH has plenty of literature online from manuals to troubleshooting guides. If you don't know the system, what does your control panel look like?

[win21llc]

310 series I believe, no air dump ! According to HWH schematic,relay marked Park in control box to be grounded by grounded by Park brake switch ! When I ground that wire sysrem works as intended ! Just can’t seem to find a switch in the pull button area for PB ! Very congested in the area though .
Chuck

[mose]

Since the park brake releases with air, it's likely an air pressure switch that looks like your brake switches. Maybe behind front panel in front of steering column. There's an air manifold up there.