Introduction to Electrical System Section

In addition to the fuses and relays mounted in the fuse panel (behind the operators seat), these tractors are also equipped with solid state load centers located in two of the electronic controllers.

These solid-state load centers replace fused relay circuits previously used. The primary function is to control the majority of high current loads such as fender flood lights and the horn. This electronic circuitry will monitor loads and voltages to provide fast reaction time and the ability to alert the operator if a circuit overloads or if voltage is out of specifications, i.e. open circuit (undercurrent) or short circuit (over-current).

If circuit is faulty and a diagnostic trouble code is generated, the circuit will stay in the OFF state and diagnostic trouble code will remain active until the circuit is shut off by the operator. If the circuit or one of its components is turned back ON and the problem is not present, the system will function normally.

As an example, if a light circuit is determined to have an over-current condition, it will shut off. If the operator turns the light switch off and then back on to clear the fault, and the current sense reading is zero amps with the light off, the logic circuit will turn back on.

If the total current load of the solid state load center exceeds a preset level, the software will begin to shut down the system, turning off one circuit at a time. The logic circuit will wait a few seconds between circuit shutdowns to determine if the total controller current has fallen below preset level, or if additional circuits should be turned off.

Solid state circuits are rated for a fixed value. If any additional electrical devices need to be added to the tractor, we recommend to use a power strip or convenience outlets in conjunction with an off/on switch. Splicing into a wire in the wrong location could cause the circuit to overload and shut the circuit down.

If extra implement lights and controls, such as switches are needed, contact your John Deere dealer. He can provide information on methods to tie in the light switch with one of the accessory wires located in the 7 pin terminal on the back of the tractor.