No power to cab accessory outlet

[aw113sgte]

Figured it was just unplugged, but nope. Also checked power at the fuse and nothing. This is an a1r.
Power is going into the pdp so it seems strange power is not at the fuse input, and the TMs indicate nothing else in the way of the distribution. Before I try opening the pdp and breaking aging plastic tabs (leftmost one) I figured I would ask. Heard the accessory is often disabled due to people killing batteries from plugging in phones.

 

[Ronmar]

Where is this accessory port?

 

[aw113sgte]

Where is this accessory port?

The "cigarette plug" - passenger side kick panel

 

[aw113sgte]

No +12V on either side of CB84

 

[hike]

A1R truck?

 

[aw113sgte]

A1R truck?

Yep

 

[GeneralDisorder]

Huh. Never seen one disabled on purpose. I doubt that story. The outlet is there to keep soldiers from running their own wiring to the batteries. I used to carry an inverter with alligator clips to run my portable DVD player off the HMMWV batteries. Fuses? We don't need that foolishness. And the wires of course are usually just pinched under the passenger seat to get them to the battery terminals. Nothing good came of this when it was done by people that are *not* 52D power generation equipment technicians such as myself. So they added 12v acc. outlets.

 

[Ronmar]

I wiird a car stereo onst… I can handle this

perhaps someone put in a no-blow fuse, and cooked off the solder run on the circuit board in PDM1 associated with CB-84?

 

[GeneralDisorder]

I wiird a car stereo onst… I can handle this

perhaps someone put in a no-blow fuse, and cooked off the solder run on the circuit board in PDM1 associated with CB-84?

Unlikely. There's no solder in the modular PDP panels. It's just riveted bussbars. I opened one:

 

[Ronmar]

well power in and no power out, the pipe is broken somewhere...

The earlier versions of those PDM's like the VIM in the A0 trucks was a traditional circuit board with bonded circuit runs between the solder points. Never seen inside a new one, looks much more robust. Thanks for the peek.

 

[GeneralDisorder]

Yep. Worth testing but I'm guessing the constant +12v power supply to the PDM module for the accessory outlet is the issue. It is not ignition switched. The accessory outlet has power all the time unless you switch off the batteries.

 

[aw113sgte]

Yep. Worth testing but I'm guessing the constant +12v power supply to the PDM module for the accessory outlet is the issue. It is not ignition switched. The accessory outlet has power all the time unless you switch off the batteries.

Thanks for those pictures, never seen the inside.
Was hoping to figure out how the power got in (wire number, connector number). Not sure if that power is shared with other things in that pdp or not. Well guess I get to open it up and investigate.

 

[GeneralDisorder]

The troubleshooting for that fault runs right to PDM 1 and when your reading is 0v at CB86's socket it tells you to replace PDM 1.

I don't know about that. I think I would be checking for where PDM 1 is getting it's constant +12v from and where else it's sending it......

 

[Ronmar]

There is a page elsewhere in the diagrams that has a more detailed PDM1 diagram that should show the connector and pin for 12v batt in and out. Like the drawing pic you posted shows that accessory output connector and pin, P101-E.

 

[aw113sgte]

Turned out the power side was just fine it was the ground side that was the issue. The ground was good all the way up to the back prong of the outlet, somehow there was a break between the back prong and the outer barrel. Got lucky and just happened to have a panel power outlet that looks like the same manufacturer as the original.

 

[Ronmar]

Cool!