Power Take-Off: Description
The Ram 3500/4500/5500 Chassis cab models equipped with gas and diesel engines that have the PTO prep option (LBN) have the capability of mounting and controlling a PTO. The control function of the PTO system involves 4 auxiliary switches and 1 PTO switch. These switches are located on the auxiliary switch bank (Switch Pod) located on the center of the instrument panel below the radio. These switches are integrated into the vehicles electrical architecture (LIN signals) with their outputs found underhood in connectors located on the auxiliary PDC. Please note that these switches are hard wired to only switch power (12V) via their relays; they can not be used for such applications as PTO without Upfitter modifications. The vehicle comes with a kit that contains all required mating half terminals and connections to allow for ease of upfit.
Auxiliary Switch Bank:
- AUX 1, 2 can be either Battery or Ignition (customer choice via 5A fuse location in the PDC - refer to the appropriate service information ).
- Switches AUX 3, 4 and PTO are set to Ignition.
- AUX 3, 4 switches will maintain "last known state functionality"; AUX 1, 2 and the PTO switch will not.
Connections to the switches are found underhood in the dark gray connectors attached to the auxiliary PDC. Refer to the appropriate service information for detailed instructions.
The Auxiliary PDC is standard equipment on all chassis cab models. This Aux PDC houses 8 fuses that are PTO functional:
- 1 fuse for the PTO switch.
The 40A, 25A, and 20A PTO fuses can be moved as desired to any of the switches 1, 2, 3, 4 or PTO. These fuse "sizes" are for identification purposes only. Refer to the Chassis Cab Upfitter Schematic in the Upfitter Wiring Interface Instructions for max. allowable continuous amperage for a given fuse "size".
- 1 fuse for each of the 4 auxiliary switches.
- 1 for 20 amp Upfitter battery feed.
- 1 for 20 amp Upfitter ignition/run feed.
- 1 five amp mini fuse which can be customer located in its holder to allow changing switches 1 and 2 from ignition feed to battery feed.
Please note that switch 1 and switch 2 can be changed from ignition feed to battery feed by moving the 5A mini fuse (Refer to the appropriate service information ). All switches will be shipped from the factory as ignition fed to minimize battery drain.
The Auxiliary PDC houses 6 relays that are PTO functional:
- 1 relay is for PTO switch.
- 1 relay for each of the 4 auxiliary switches.
- 1 relay provides 20 amp Upfitter ignition feed
** The 40A, 25A, and 20A PTO fuses can be moved as desired to any of the switches 1, 2, 3, 4 or PTO. These fuse "sizes" are for identification purposes only. Refer to the Chassis Cab Upfitter Schematic in the Upfitter Wiring Interface Instructions for max. allowable continuous amperage for a given fuse "size". **Please note that switch 1 and switch 2 can be changed from ignition feed to battery feed by moving the 5A mini fuse (Refer to the appropriate service information ). All switches will be shipped from the factory as ignition fed to minimize battery drain.
Each individual switch is not available for service replacement. If one or more switches are inoperative, the entire switch bank must be replaced. Refer to POD, SWITCH, REMOVAL . To diagnose the switch bank switches, use a scan tool and the appropriate diagnostic information.