New Holland T8010 Manual page 1322

ELECTRICAL SYSTEMS SCHEMATICS AND DIAGNOSTICS
Power Distribution System Circuit Operation
Power distribution consists of the following:
1. Unswitched battery power. Unswitched power is available at all times. The battery positive terminal is
connected to the unswitched power bus from which all unswitched power circuits are energized.
Power is available to all of the following fuses 7, 8, 10, 11, 13, 14, 15, 16, 17, 18, 19, 20, 32, 42, and 53
regardless of the ignition switch position. If equipped with an GPS harness, fuses 327 and 328 also see
unswitched power. These fuses are contained in a fuse holder that is part of the GPS harness.
2. Switched battery power. This power is supplied to the system when the ignition system is ON. This switching is
controlled by relay.
When the ignition is switched ON the cab power relay is energized, supplying battery power to the switched
power bus which in turn supplies power to fuses 1, 2, 3, 4, 5, 6, 9, 12, 22, 23, 24, 25, 26, 27, 29, 30, 31, 34, 35,
37, 39, 41, 43, 44, 45, 46, 47, 48, 49, 50 and 52. Additionally the controller relay is energized and power is
distributed to fuses 33, 36, 38, 40, 43 and 44.
The front wiper/wash circuit is also supplied with switched power through circuit breaker 51.
Power Distribution Circuit Troubleshooting
Before troubleshooting the power distribution system make sure that the following operating conditions are met:
1. The batteries are fully charged and all connections are clean and tight.
2. Transmission in neutral or park.
3. Check all connectors for full installation, loose, corroded or pushed out terminals.
4. Determine if the power source being investigated is switched or unswitched.
5. If the power source problem is a switched power source, the relay controlling the circuit needs to be determined
and tested.
Power Distribution Schematic
See Electrical Schematic 87389710.
Section 55 - Electrical System - Chapter 1
55-1-141