Connect the positive (red) clamp to the + post. 
Guide
Subaru Check Engine Light Problems
In this guide, you will learn what Subaru Check Engine Light (CEL) means, common problems and how to read engine codes yourself.
In this guide, you will find instructions on how to jump-start a Subaru using a portable jump starter.
What you will need
Procedure
- Use the metal key in your keyfob to unlock the driver's door.
- Ensure transmission is in Park position and Parking Brakes are engaged. Do not insert the key in the ignition yet.
- Pull the hood release under the dashboard the hood of the Subaru.
- Locate the positive jump starting terminal. Connect the positive (red) clamp to the + post.
- Connect the other red clamp on the other end of the jumper cables to the positive terminal of the car with a good battery.
Connect the black clamp to the negative battery terminal on the car with the good battery. - Lastly, connect the black cable to an unpainted bolt or to a non-moving metal part on the engine of the Subaru with the dead battery.
- Start the car with the good battery and let it idle in Park.
- Press unlock on your Subaru key to ensure the car is powered up and the alarm system is disabled. Start the car.
- Don't turn off the engine immediately. Allow the alternator to charge the battery for at least 30 minutes.
If your Subaru won't start, only clicks check the jump starter clamps. Wiggle the clamps a little bit to make sure they are making good contact and try again.
If your Subar won't start when you try to jump start it, keep the other car running and allow it to charge your Subaru battery for 15 minutes then try again.
If using a jump box, keep the jump connected for 15 minutes. Make sure the jump box is fully charged.
