Snowmobile Polaris 2006 - 2007 FS / FST. Manual - part 64

12.11

Chassis Electrical System

12

Rev. 1 07/2006

2006 Chassis Relay Circuit

The chassis relay circuit supplies battery voltage to the
following systems:

• Head Lights, Tail Lights

• Hand and Thumb Warmers

• Accessory Take-Off Pigtails

• Alternator Charge Field Coil Activation (Alternator 

charges battery when RED/WHT circuit is energized.)

• M-10  ACE  System

12.12

Chassis Electrical System

Rev. 1 07/2006

Chassis Relay

The ECU controls the chassis relay via the relay control circuit
(ECU Pin 215). To verify the chassis relay circuit is energized
(closed):

• Verify that the headlights turn on after the engine has 

started and the engine idle RPM has stabilized.

• Perform a Vdc test at the positive and negative battery 

terminals. At least 14 - 14.5 Vdc should be present at 
the battery terminals when the chassis relay circuit is 
closed.

• If 14 - 14.5 Vdc is not found at the battery when the 

engine is running and the headlights are illuminated, 
verify the RED/WHT alternator charging switch circuit 
is connected to the alternator. The RED/WHT circuit 
should show 14 - 14.5 Vdc (battery voltage) whenever 
the chassis relay is energized. This lead turns the 
alternator’s charging field on (chassis relay closed) or 
off (chassis relay open).

• If 14 - 14.5 Vdc is found on the RED/WHT circuit at 

the alternator, verify the alternator drive belt has the 
correct amount of tension.

• Verify the fusible links are not blown.

• Replace the alternator assembly if the alternator fails to 

activate when the RED/WHT circuit is energized with 
battery voltage.

The circuits powered by the chassis relay can
be energized and tested when the engine is
off by supplying 12 Vdc external battery
voltage to the chassis diagnostic plug. The
plug is located underneath the handlebar
cover.

When connecting an external 12 Vdc battery
to the chassis diagnostic plug, connect the
RED(Positive) wire to the RED/WHT plug
terminal and the BLACK(Negative) wire to
the BROWN plug terminal.

12.13

Chassis Electrical System

12

Rev. 1 07/2006

Start Solenoid Relay Circuit

12.14

Chassis Electrical System

Rev. 1 07/2006

Start Solenoid Relay Control Circuit

Start Solenoid Grounding Relay Circuit

The start solenoid is responsible for completing the starter motor
solenoid’s ground circuit. The start solenoid relay DOES NOT
directly supply power to the starter motor.

Battery voltage is supplied to the power-side of the starter motor
solenoid when the key is turned to the “START” position. The
ECU will activate the start solenoid only when the safety slap
switch is in the “UP” position. 

The key-switched start solenoid power supply is protected with
a diode to prevent voltage back-feeding during starter motor
activation and de-activation.