Electrical components
200-amp alternator

200-amp alternator

The high-capacity alternator provides plenty of power to handle the increasing electrical loads of today’s auxiliary functions and implements.
 
Located on the rear of the transmission, a 200-amp alternator is standard on all models. The alternator is powered by an auxiliary drive from the transmission input shaft.
Two 12-V batteries
 
Magnetic cover installed

Magnetic cover installed

Cover removed, exposing batteries and storage

Cover removed, exposing batteries and storage

The battery-mount location allows for two 12-V (925 CCA each) sealed-type batteries. The batteries are located on the left side of the tractor. The cover is held in place with a magnetic latch and is easy to remove for servicing the batteries or access to the storage tote.
 
The side-by-side design provides simple battery and cable accessibility.
Boost terminal
 
Boost terminal location

Boost terminal location

Battery boost terminals are provided for convenience to assist with boosted starting.  The terminals are also used as the connecting point to charge the tractor’s batteries. 
SmartCircuit load center and electrical fuse panel
 
Fuse location under panel - Behind seat

Fuse location under panel - Behind seat

The 8R and 8RT Series Tractors are equipped with controller area network (CAN) technology. This electronic feature provides additional functions and onboard computing power is provided for efficient operation.
 
The SmartCircuit portion of CAN technology provides the following features:
  • Fewer fuses and relays
  • Fewer wiring connections
  • Diagnostic capabilities
The SmartCircuit system can detect most circuit problems and display them on the CommandCenter™ display, providing diagnostic information as to where a problem may exist. Detailed service trouble codes give the operator and John Deere service technicians more information to quickly resolve a problem.
 
Electronic control units have the ability to accept updates for the operating software and easily add features to the electronic system. If service or updating is required, your John Deere dealer can do a simple, tractor serial number specific procedure via an online service tool called Service ADVISOR™.
 
The electrical fuse panel is conveniently located under the operator’s manual pocket on the upholstery below the rear window latch. It contains easy-to-replace, automotive, blade-type fuses and relays for quick servicing. Only a small number of relays are used and most are visible with the cover removed.
7-pin outlet
 
7-pin outlet for implements

7-pin outlet for implements

All 8R and 8RT Series Tractors have a 7-pin terminal outlet that conforms to American Society of Agricultural and Biological Engineers (ASAE) and Society of Automotive Engineers (SAE) requirement that provides electrical power for wagons, trailers, or other implement requirements.
Implement connector
 
Implement connector

Implement connector

This connector is located in a convenient location to attach ISO-compliant implement wiring (for example, SeedStar™ planters and AccuDepth™ implements use this connector to function).
 
The implement connector has been engineered to ISO standards to provide compatibility with ISO bus-type implements.
 
8R and 8RT Series Tractors are ISO bus certified.
3-pin outlet, power outlet, and Service ADVISOR data port
 
Power outlets

Power outlets

Service ADVISOR data, 3-pin outlet

Service ADVISOR data, 3-pin outlet

There are 3-pin electrical outlet sockets and power outlets provided near the cup holder near the right-hand-side window.    
 
The 3-pin connector includes hot, or unswitched, power for maintaining monitor memory when the tractor is shut off.  This is used where current drain is minimal to prolong battery life during tractor off periods.  Switched power and ground connections are also included. 
 
The Service ADVISOR data port is used by John Deere dealership service technicians to access the tractor control units for diagnostic needs or software updates.
Rear window wiring grommets
 
Rear window wiring grommets

Rear window wiring grommets

A rubber grommet is located on the rear of the cab to provide easy installation of wiring harnesses that need to exit the cab out the rear window.
 
They are easily removed by sliding upward and can be cut for fitting various sizes of wiring harnesses.
 
Last Updated : 25-Jul-2013