3-4 Published 08-25-09, Control # 077-04
ELECTRICAL SYSTEM RT9130E SERVICE MANUAL
For the grid heater relay coils to energize, the battery must
be connected and signals from the engine ECM must be
sent.
MAINTENANCE
General
Electrical system maintenance includes troubleshooting and
replacement of damaged components. Observe standard
wiring practices when replacing components.
General Troubleshooting
NOTE: Make voltage checks at terminations when
components are installed and operating. Make
continuity checks (with batteries disconnected)
when components are isolated or removed.
Troubleshoot per the following guidelines:
1. First, use reported symptoms to identify a problem or a
suspect component.
2. Test the suspect component per instructions in this
section. The instructions identify the components and
guide you from the easiest and most likely problems to
the hardest and least likely problems.
3. Using a multimeter, test the circuit for continuity if you
suspect a broken circuit or for voltage if you suspect a
power problem. Check the electrical schematic and
wiring diagram for most accurate wiring information.
4. If the component proves faulty, replace it with a known
working component. If wiring proves faulty, replace it
with wiring of equal diameter.
5. After troubleshooting, test the repaired circuit. Verify the
circuit works properly.
Troubleshooting Engine Starting Problems
1. Verify the battery terminals are connected and clean, the
transmission is in neutral, and the machine is fueled.
Item Description
1 Grid Heater Relay 2 (K602)
2 Grid Heater Relay 1 (K601)
3 Engine Starter Relay (K301)
4 125 Amp Fuse (F55)
5 125 Amp Fuse (F54)
DANGER
If it is necessary to perform electrical maintenance on live
or hot circuits, remove all rings, watches, and other
jewelry before performing maintenance as serious burns
result from accidental grounding or shorting circuits.
DANGER
Ensure the batteries are disconnected before performing
any maintenance on an electrical circuit which is not fused
or when performing continuity checks.
CAUTION
Never replace original wiring with wiring of a smaller size
(gauge).
DANGER
Many steps in the troubleshooting procedures require
testing live (energized) components. Perform these steps
observing good safety practices to avoid electrical shock
injury.
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