9850043 R01 - 2017-2021
RANGER
500 / 570 Service Manual
© Copyright Polaris Inc.
1.107
CURRENT DRAW - KEY OFF
Parasitic draw is when there is excessive current flow
with the key off.
While the most common causes of draws are improperly
installed accessories (tapping into un-switched B+
instead of switched) there can be electronic component
failures that can cause this as well.
IMPORTANT
Do not connect or disconnect the battery cable, or
ammeter with the engine running. Damage will occur to
electrical components.
IMPORTANT
Charging system damage will occur if incompatible
components are installed. Always reference the Polaris
Electronic Parts Catalog for the proper part numbers.
NOTICE
Wait ten minutes with the key off for the ECU to power
down. This will avoid a faulty readout while testing
amperage draw.
TESTING PROCEDURE
1. Remove the negative cable from the battery.
2. Connect a jumper from the negative battery cable
terminal to the negative battery post.
3. Ensure your meter leads and selector dial are set to
measure amperage.
4. Connect your red lead to the battery negative cable
terminal.
5. Connect your black lead to the battery negative post.
6. Momentarily key the ignition switch on, then off.
IMPORTANT
Ensure all electrical components are switched off, or
damage to your jumper and/or meter will occur.
7. Wait 10 minutes before checking the value. Vehicles
will vary, but electronic components will take time to
fully go to sleep after switched power is removed.
8. Maximum allowable is 10 milliamps. If your meter is
ranged to the 10 Amp scale, this will appear as 0.010
Amps.
Current Draw - Key Off:
Maximum of .01 DCA (10 mA)
9. If over 10 milliamps, go to the fuse block and start
systematically removing one fuse at a time until the
value drops, indicating the circuit that requires
attention.
TESTING VOLTAGE DROP
NOTICE
If you disconnect the connector at the load, and
measure voltage with one lead on the power supply
wire, and one to ground, you will be measuring
available voltage. This is a static test and not dynamic
voltage drop testing. Refer to Static and Dynamic
The measurement of voltage is the
DIFFERENCE
in
electrical pressure between the two points your DMM
leads are touching.
Most circuits will have one load. The load is the
component in the circuit that uses the current flow to do
work, such as move a solenoid or light a bulb.
Voltage coming into the load should be near battery
voltage with current flowing. There will be some loss from
moving through electrical contacts in connectors and
relays, but it will be minimal.
NOTICE
You will need to backprobe to perform this test. For
information about doing this safely, refer to Connector
Probing Guidelines page 1.103.
Voltage should be near fully depleted by the load. This
means that when measuring on the ground side of the
circuit, immediately after the load, back to battery
negative, you should have near zero pressure difference
(voltage).
If you do have a difference in pressure, this means there
is something adding resistance to the circuit such as
corrosion.
Summary of Contents for RANGER 500 2017
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