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u can put a coil anywhere, just make sure u have a real an i mean real good ground, i try an hide all mine that i install just to make people wonder
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Many people miss that the coil does not "ground" through the connection with the block / body. The primary side of the coil grounds through the points or the electronic ignition module. The secondary side of the coil, the side that makes spark, makes a circuit through the plug wire, plug, block, B-, B+, IGN+, and back to the coil! So the return path for the spark is the IGN+ wire. The ground connection to the coil body is especially important in case there's an open in the secondary side and the spark goes looking for an alternate path to ground. Without a good ground connection the spark may traverse the primary side and cause collateral damage to other circuits. A second function of ground is to reduce radio interference which can get quite high.