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Electrical circuit basics overview electricity is a fundamental part of the workings of most vehicles and this section aims to explain the basic principles of electrical circuits hopefully this will give you an understanding and allow you to carry out some simple calculations for specifying the electrics in your auto or marine wiring projects the fundamentals of an electrical circuit in . Convert a negative output to a positive output if you have a switch or an alarm or keyless entry that has a negative output that you wish to use to switch a device that requires 12v such as a horn dome light parking lights head lights hatch release etc wire a relay as shown below to convert the negative output trigger to a . Re 12v neg ground schematic post by jim becker sat may 24 2008 1106 pm since the green wire is the only connection between the battery alternator electrical sources and the ignition light switches electrical users i assumed the green wire was intended to be the hot lead to the switches. How to wire automotive spdt relays weak negative output to strong ground output often it is necessary to provide a stronger ground than the negative output of an alarm or keyless entry can provide when this is the case use the following diagram. 12 volt positive ground system here you are at our site this is images about 12 volt positive ground system posted by brenda botha in 12 category on apr 26 2019 you can also find other images like images wiring diagram images parts diagram images replacement parts images electrical diagram images repair manuals images engine diagram