Quote:
Originally Posted by 1930deluxe
When the car is a positive ground the frame and body is positive charged. Where does the taillights and headlights ground so they work? How do I use a voltage tester to see if I have current to the headlights, taillights ect?
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There is what is called "conventional theory" of electron flow through the system, and what is called "electron theory" of electron flow. Conventional theory (now disproven) said that current flow is from the positive terminal of the battery, through the system and back to the negative terminal.
The electron theory is the accepted theory now, and says that current flows from the negative terminal, through the system and back to the positive terminal of the battery. Therefore, a positive ground system makes more sense!
Think about this: In a modern negative ground system, electrical current flows out of the negative battery terminal, through the ground cable to the frame, engine, and body, then through the starter, coil, lights, etc. ending up at the positive battery cable and flows back the positive battery post.