APX 8500 Power Help

[aschenavar]

Greetings...looking for a little guidance here if anyone might have some.

We have a APX8500 remote head (O5) mounted in our fire apparatus that has worked and had zero issues since the install. Recently the radio doesn't power up at all. It is installed with ignition sense and I believe has the option to power up without that as well. I have checked the following:

Power to the deck - present
All cables/connections pulled and re-secured
A different O5 head placed in and still nothing

Based on the mounting location of the deck and head, it's very unlikely that we pinched or hit any wires with anything. I'm just trying to do a little chasing before we make a trip to the repair shop.

Thanks in advance!

 

[jeepsandradios]

Red/Black B+ to deck and Red/Yellow/Black to head. Does head have power ?

 

[aschenavar]

It does not appear to be receiving power is my guess at this point..

 

[FFPM571]

Check the head power wires Red should be B+ constant Yellow Ignition enabled. Black ground

 

[Tech21]

Assuming your truck has a battery disconnect otherwise known as a master switch, if properly connected, flipping the switch should automatically turn the radio on. With the master switch turned on, their should be 13.8v DC, or close to it, on the red wire. This depends on battery charge level. Check the fuse holder and verify the 4 amp fuse isn't blown. The transceiver at this point should have 13.8v DC, or close to it. Check the red fuse holder and verify the 20 amp fuse isn't blown. The black wire goes to a solid, metal on metal ground point. These aren't too hard to find on af fire truck.

The above applies to a dash mount.

On a remote mount, the red plug on the control head has a yellow, red, black and speaker connection coming out of it. The blue is the control cable. The red is power to the control head, the yellow is ignition sense and black is ground. Find the fuse holders and verify that no fuses are blown. There shoudl be 3 of them. 1 for ignition, 1 for power to the control head and 1 for power to the radio.

IF ANY FUSES ARE BLOWN, HAVE THE TRUCK INSPECTED AND SERVICED BY A PROPER, QUALIFIED TECHNICIAN. FUSES BLOW FOR A REASON.

If you want to confirm whether it's a wiring issue before saying the radio is dead, plug it in to a different truck. If it powers on, then you know the original truck has a problem.

 

[aschenavar]

Assuming your truck has a battery disconnect otherwise known as a master switch, if properly connected, flipping the switch should automatically turn the radio on. With the master switch turned on, their should be 13.8v DC, or close to it, on the red wire. This depends on battery charge level. Check the fuse holder and verify the 4 amp fuse isn't blown. The transceiver at this point should have 13.8v DC, or close to it. Check the red fuse holder and verify the 20 amp fuse isn't blown. The black wire goes to a solid, metal on metal ground point. These aren't too hard to find on af fire truck.

The above applies to a dash mount.

On a remote mount, the red plug on the control head has a yellow, red, black and speaker connection coming out of it. The blue is the control cable. The red is power to the control head, the yellow is ignition sense and black is ground. Find the fuse holders and verify that no fuses are blown. There shoudl be 3 of them. 1 for ignition, 1 for power to the control head and 1 for power to the radio.

IF ANY FUSES ARE BLOWN, HAVE THE TRUCK INSPECTED AND SERVICED BY A PROPER, QUALIFIED TECHNICIAN. FUSES BLOW FOR A REASON.

If you want to confirm whether it's a wiring issue before saying the radio is dead, plug it in to a different truck. If it powers on, then you know the original truck has a problem.

Awesome, I am back on shift today. Everything you mentioned in your reply appears to relate to our set up. I may dig into the truck and see if I can locate the fuses. I appreciate the break down on all of that!