09-08-45-003E Installation of Electrical Aftermarket Accessories on 2-Mode Hybrid Full Size Trucks - (Jun 21 2012) - part 3
radio relay pin pin (30) (86) relay (37a) (37) (as) 10 radio (1 d50)
Install relay (P/N-12193601) with 5-way pigtail connector (P/N-15306045) as shownin the above diagram to ensure the load from the radio is connected to the 30-ampBattery feed, and not the 10 amp Run/Crank circuit. Connect the 30-amp Battery Feed(circuit 2340) from pin 5 of the MBEC to pin 30 of the relay. Connect pin 87 of therelay to the radio. Connect the 10 amp Run/Crank (circuit 739) from pin 7 of theMBEC to pin 86 of the relay coil. Connect pin 85 of the relay coil to Ground (circuit1050) on pin 1 of the MBEC.
Caution:To prevent damage to any sensitive electronic components, use the relay listed whichincludes a suppression resistor circuit. The integral suppression resistor will preventa voltage spike from being transmitted onto the Run/Crank circuit. Damage to the vehicleby failing to install this relay as part of this aftermarket installation is not coveredunder warranty.Parts Information
5–Way Connector w/Leads
The location for the accessory power and ground can be acquired at the Mid-BussedElectrical Connector (MBEC). The power and ground can be connected at this locationwithout having to splice or cut into the existing wiring. The total power availableat the Mid-Bussed Electrical Connector (MBEC) location is 25 amps.
Danger:The wire harnesses and cables for the hybrid high voltage circuits are encased inan orange colored covering. In addition, high voltage components such as the EnergyStorage System and high voltage cables are affixed with “High Voltage” red danger,and orange warning labels. The intermediate 42 volt system is encased in a blue coloredcovering, and has yellow caution labels on the components, wire harnesses,and cables. Do not remove, open, take apart, or modify these devices. Do not probe,tamper with, cut, or modify high voltage, or intermediate voltage cable or wiring.
The MBEC (4) is located below the instrument panel to the left of the brake pedalas shown above.
The MBEC has 10 positions for connecting electrical connectors. One of these positionsis designated for aftermarket utilization. Install a connector (P/N-20791502) intothe open position identified as X14 as shown above.
Important:Connector P/N-20791502 comes with a one wire lead installed. This lead will need tobe removed before the connector is pinned for use with an accessory.
Within this connector, there is a fused 30 Amp battery feed, a fused 15 Amp batteryfeed, a fused 10 Amp Run/Crank feed, a 300 milliamp Retained Accessory Power (RAP)feed and a ground.
Caution:Do not connect any components to cavity 2 (15 Amp Battery Feed), or cavity 8 (300milliamp RAP Feed). Adding electrical draw to any of these circuits can cause vehicleperformance issues and potentially decreased life of the APM.