An important step in figuring out electrical problems is understanding the circuit design of the circuit you're trying to diagnose. Determining if the circuit is ground side or positive side switched is a good start when you don't have a wiring diagram handy. In this video ScannerDanner and I talk about how to determine if a circuit is ground side or positive side switched using basic electrical troubleshooting tools. Now this does not come without some drawbacks as pointed out in the video, but it will still get you started if you're trying to figure out an electrical problem. If nothing else this video shows some basic circuit design principals that you can use to increase your electrical knowledge.Here's some links.ScannerDanner channel: http://www.youtube.com/user/ScannerDanner?feature=CAkQwRs%3DEngine Performance Diagnostics by Paul Danner: http://www.autocomputerstroubleshooting.comSolving Electrical Problems: http://www.ericthecarguy.com/faq/solving-automotive-electrical-problemsRosedale Technical Institute: http://www.rosedaletech.orgDiscussion about this video: http://ericthecarguy.com/kunena/18-The-EricTheCarGuy-Video-Forum/49815-ground-side-power-side-switching-w-scannerdanner#89792The best place for answers to your automotive questions: http://www.ericthecarguy.comEricTheCarGuy code lookup: http://www.ericthecarguy.com/obd-code-lookupFacebook: https://www.facebook.com/EricTheCarGuy?fref=tsTwitter: https://twitter.com/EricTheCarGuyGoogle+: https://plus.google.com/100195180196698058780/postsInformation on Premium Membership: https://www.ericthecarguy.com/premium-content-streaming-etcg-contentStay DirtyETCGDue to factors beyond the control of EricTheCarGuy, it cannot guarantee against unauthorized modifications of this information, or improper use of this information.  EricTheCarGuy assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. EricTheCarGuy recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video.  Due to factors beyond the control of EricTheCarGuy, no information contained in this video shall create any express or implied warranty or guarantee of any particular result.  Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not EricTheCarGuy.