STEP 1: Engine or Start Circuit
STEP 1A: Crank the Engine
STEP 1B: Inspect Wiring Harness Connector
STEP 1C: Check Start Switch to ECM Wire
STEP 1D: Check for Active Fault Code(s)
STEP 2 Check Start Circuit
STEP 2A: Check Battery Voltage
STEP 2B: Check Neutral Safety Switch
STEP 2B1: Check the Neutral Safety Switch Adjustment
STEP 2B2: Check the Neutral Safety Switch Contacts
STEP 2B3: Check Fuse Box Fuse
STEP 2B4: Check Wire From Fuse Box to Neutral Safety Switch
STEP 2B5: Check Fuse Box to Alternator Wire
STEP 2B6: Check the Alternator to Battery Relay Wire
STEP 2B7: Check 75 Amp Fuse
STEP 2B8: Check Neutral Safety Switch to Interlock Relay Coil Wire
STEP 2C: Check Interlock Relay
STEP 2C1: Check Fuse F10
STEP 2C2: Check Start Switch to Interlock Relay Wire
STEP 2C3: Check Interlock Relay to Fuse Box Wire
STEP 2C4: Test Interlock Relay.
STEP 2D:Check Starter Relay
STEP 2D1: Check Fuse Box to Starter Relay Input Coil Wire
STEP 2D2: Check Starter Relay Output Coil to Starter Wire
STEP 2D3: Check Starter Relay Input Contact to Starter Wire
STEP 2D4: Check Starter Relay Output Contact to Starter Wire
STEP 2D5: Check Starter to Chassis Ground Wire
STEP 2D6: Test Starter Relay
STEP 2E:Check Battery Relay
STEP 2E1: Check Battery Relay Input Coil Wire to Start Switch
STEP 2E2: Check Battery Relay Output Coil Wire to Chassis Ground
STEP 2E3: Check Battery Supply Wire to Battery Relay Input Contact
STEP 2E4: Test Battery Relay
STEP 2F:Check Start Switch
STEP 2F1: Check Start Switch to Battery Relay Output Contact Wire
STEP 2F2: Check 65 Amp Fuse
STEP 2F3: Check Start Switch B to BR Contacts
STEP 2F4: Check Start Switch B to C Contacts