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How do you tell the difference in the negative and positive on a coil?
Wiki User
∙ 13y ago
Normally the terminals are marked on the coil ( if it's a bosch coil the one marked 15 is the primary winding positive terminal ). The large center one is the secondary positive ( the one that leads to your distributor ) and the two on the sides of it are the positive primary and the ground. If you don't know wich one is wich disconect the battery then disconnect the two smaller wires and remember wich one goes where. Use an ohm meter to test the resistance between a good ground on the body or engine block on each wire. The one that has no or very low resistance is the ground wire. If you are holding a coil in your hand and it isn't marked use the ohm meter to check the resistance between the secondary positive and the other two terminals. There should be infinite resistance ( open circuit ) to the positive of the secondary and 6Kohms or there abouts to the common ground terminal.
Wiki User
∙ 13y ago
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