You turn the key or activate the starter button on your ATV, but nothing happens. No lights, no power to the display, or no power at the ignition. What do you do, and what may be wrong?
Here are the most common causes to look into when your ATV is not getting any power.
Make sure the kill switch is in the “run” position
Always begin by eliminating the quick and easy stuff first.
When the kill switch is in the “stop” position, it cuts all electric power to most systems on the ATV.
Many don’t use their kill switch that often, and usually just leave it in the “run” position. Therefore we tend to forget checking the position of the kill switch when we are facing issues such as loss of power.
It is easy to bump over the switch by accident or to forget that it was activated the last time you stopped the ATV.
So maybe setting the kill switch to “run” is all that it takes to fix your issue.
Make sure the kill switch is not corroded or full of dirt and water
Another possible issue with the kill switch is internal corrosion due to water getting inside.
Dirty water in reaction with air will cause green oxide to form on the metal components inside the switch. Suck corrosion will prevent a proper connection.
If the switch is just lightly affected, you may get it working again by flushing it with some anti-corrosive like WD-40 or electric cleaner. Turn the switch on and off repeatedly until it hopefully starts working again.
For a longer-lasting repair, you need to disassemble the switch, clean the insides properly, and then pack it with dielectric grease. The grease will prevent future corrosion.
Make sure the main power switch is turned on
After making sure the kill switch is OK, it’s time to inspect the battery.
Some ATVs have a power cutoff switch near the battery that cuts all electricity.
Having such a switch is useful when working on the electric system without having to disconnect the battery. It is also a quick way to prevent parasitic battery drain when you don’t use the ATV for more extended periods.
As with the kill switch, it is easy to forget that it is turned off.
Make sure battery connections are not loose, corroded or disconnected
Battery connections may come loose, so make sure they are tight and not moving.
Over time corrosion may build up on the battery terminals and on the connectors. If they seem corroded, disconnect the connectors from the battery terminals and clean them by using a Scotch Brite pad and some baking soda dissolved in hot water. Wear eye protection and rubber gloves.
Many ATVs have more than one connector that goes to each battery terminal. When replacing or for some other reason disconnecting the battery, It is easy to forget installing one or more of the connectors.
Make sure all positive connectors (usually red wire) are connected to the positive battery terminal, and that all negative connectors (usually black wire) are connected to the negative battery terminal.
Tip: Take a photo of the wiring before removing the battery. It will make it easier to connect the wires correctly.
Make sure the battery is charged and in good condition
Many ATVs are used only sporadically with more extended periods where the ATV is left standing. By leaving a relatively small battery like the ones you find in an ATV unattended for more than a few weeks, you are asking for trouble.
Use a multimeter to make sure the battery voltage is above 12.4V. Note that the battery may be bad even if you get a good voltage reading.
Check this guide on how to test an ATV battery.
Make sure there are no blown fuses
After making sure the battery is in good shape, it is time to check all fuses on the ATV.
Keep in mind that your bike likely has fuses located in more than one place. You typically have one main fuse box and a large fuse near the solenoid, or on at the starter relay (near the battery).
Please refer to your users manual for the location of the fuses on your ATV.
The easiest way to check if a fuse is blown is by using a multimeter to test for continuity.
On the backside of each fuse, you will find two exposed metal spots. These are there for testing the fuse.
Set the meter to the “continuity” setting, stick the positive lead to one of the metal spots, and the negative lead to the other spot.
If you get a beeping or buzzing sound from the meter, you know the fuse is fine. Check all of the fuses and replace those that do not pass the continuity test.
Note that a fuse may be blown even if the metal lead inside the fuse looks intact.
Make sure the ground wires are not loose or corroded
You now know that the battery is providing power and that all of your fuses are good.
The next step is to make sure that no ground wires have come loose or are corroded. A bad ground wire will prevent proper electric function.
Start by the battery and trace all black cables to where it is connected to the frame or other solid metal parts of the ATV.
If you see any signs of corrosion, it is a good idea to disconnect the cable and clean both the connector and the mounting spot properly.
Tighten down all connectors so that they are mounted snug.
Inspect for damaged cables and possible short circuits
If you did find blown fuses, it is not always enough to replace the fuse. You need to find the cause of your blown fuse as well.
The purpose of a fuse is to serve as the weakest link in the electric circuit. The fuse is designed to break if something is causing a higher current draw than the components and wires in the curcuit was designed for.
Short circuits to ground or short-circuits to power are typical causes of blown fuses.
A short circuit is simply when the current, for some reason, travels in an unwanted path.
If a live cable (typically red) gets damaged, exposing the conducting wires inside and they touch an exposed metal part of the bike, you get a short to ground.
A short circuit can also happen between two cables. If a live cable and a ground cable is damaged in the same spot, you may get a short circuit to power.
Start by the battery and inspect the wiring harness to see if there are any damages.
The insulating layer of a cable can get damaged from rubbing against a sharp object.
Another typical scenario that leaves long term stored ATVs vulnerable is shed-rodents. For some reason, mice who love nibbling on ATV cables seem to prefer red and yellow live wires.
Check for a bad rollover shutdown relay
Some ATVs have a relay that cuts all power to the rest of the ATV if it flips. It may be located near your battery, but refer to your ATVs schematic to learn if your bike has one.
If this relay fails or has a bad connection, you won’t get any power to the bike, including the ignition.
Common problem: A corroded or bad ignition switch
The ignition switch cuts all power except for the systems that are always live, like the starter solenoid. When it’s not working, you won’t see any sign of power either in the instrument panels, lights and it won’t send a signal to the starter solenoid, telling it to activate.
Ignition switches are known to go bad due to corrosion and from getting packed with dirt and debris.
Inspect the wires where they connect to the back of the ignition switch. Any sign of corrosion is an indication of internal corrosion as well. Blown fuses are another sign of a possible short inside the switch.
To test the switch, you can use a multimeter to check the hot wire (usually red) that goes into the switch. It should have constant power. The switched wire that comes out of the switch (typically black or brown) should have 12V only when the switch is turned on. If so, you know the switch is OK.
Short term fix
As a quick fix, you can try cleaning the switch by flushing it with an electric cleaner or WD-40. Use the supplied straw to spray generous amounts of cleaner through the keyhole hole.
Then activate the switch several times before blowing compressed air through the keyhole to remove the cleaner fluid along with any debris.
If you get the switch to start working, you can spray some dielectric grease through the keyhole to protect the inside of the switch against further corrosion.
Long term fix
Remove the ignition switch to see if it can be disassembled for a more thorough internal cleansing. After cleaning, it is a good idea to stuff it with dielectric grease to prevent further problems down the line.
Many types of ignition switches are not designed to be disassembled. If that is the case, you need to replace it with a new switch.
Check the solenoid connections
Solenoid connections are known to corrode or come loose. Make sure all connections are snug and in good shape.
Solenoids are typically extra prone to corrosion due to being exposed to mud and water. It’s not uncommon that they corrode so badly that pieces of the connectors break off, leaving them unable to deliver power to the starter.
While you are there, you should make sure the solenoid is getting power. This post will tell you how to find the solenoid and how to test if it is getting power.
Possible causes of random loss of electric power
In some cases, you find that the ATV is getting power only periodically.
Maybe you were able to start and run the bike as usual, but then it suddenly dies for no apparent reason.
Other times you may not even be able to start the bike, but the instrument panel and fuel pumps turn on and off repeatedly.
Here are a couple of possible issues to look into when facing this type of behavior:
Faulty ECU/ECM unit
The Engine Control Unit (ECU) or Engine Control Module (ECM) is an electric control unit that controls the various sensors, actuators, fuel injectors, ignition, and ancillaries of the engine.
If it fails, you may get symptoms such as random loss of power, almost as if a connection is loose. Your dealer may or may not be able to verify that you have a faulty unit.
A bad voltage regulator, causing too high of a voltage being run through the system, is a common cause of a faulty ECU/ECM. On most modern ATVs, the ECU/ECM and voltage regulator are combined in one single unit.
Test the voltage of the current exiting the module. If the reading is too high (typically 14.4V), you may need to replace the unit.
Auto circuit breaker cut of too soon
Some ATVs use auto circuit breakers that will cut off when the fuse gets too hot. When they cool down, the power will return.
The bi-metallic strips inside the breaker can wear or develop a bad connection, making the breaker run hotter than it should. This will cut the power sooner than it should.
One option is to replace the breakers for new ones.
An alternative that some users report having success with is merely replacing the breakers with similar rating standard blade fuses.
When all else fails
If none of the suggested steps in this post identified the issue, you might need to do a complete inspection of the electric system.
Begin your testing at the battery and trace every hot wire until you find where you don’t get a reading. It’s a tedious job, but hopefully, it will help you identify the root cause of the issues you are having.