Honda Engine Starting System RD 12/RD 12Awc_tx000693gb.fm 363.3 Checking the Key SwitchPrerequisites Multimeter Fully-charged (approximately 12V) battery Functioning 20A main fuseBackground The key switch is a three-position switch: ON, START, and OFF. When in the START posi-tion, the key switch directs battery voltage to the crank relay.Procedure Follow the procedure below to check the key switch.1. Remove the screws that secure the plate (a) to the back of the control panel and removethe plate.2. Using the multimeter, check the voltage between the BAT terminal (b) of the key switchand ground. For easier measuring, remove the plug and measure voltage at the plug.Is battery voltage (approximately 12V) measured?3. Place the key switch in the START posi-tion.4. Re-install the plug to the key switch.5. Check the voltage between the “S” ter-minal (c) of the key switch and ground.Is battery voltage (approximately 12V) measured?6. Re-install the plate to the back of the control console.The key switch has now been checked.Yes ____ No ____Continue Check the continuity of red wire #13 between the key switch and20A main fuse. Repair red wire #13 as needed.Yes ____ No ____The key switch is OK. The key switch has failed; replace it.
