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Old 29-05-2010, 11:25 AM
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Default Wiring diagram for 12v coil

Just wiring up my new bosch coil gt40r with resisitor, and come across a problem.. the resistor has a back wire running from it i assumed it was earth so hooked it up to chassis. Turned key one click and smoke started poring out from that wire overheating... does anyone have a wiring diagram for coil? and what is this wire that overheated?
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Old 29-05-2010, 12:38 PM
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Sorry, I don't have a wiring diagram, but I can tell you that there is no earth connection at the resistor.

On one side of the resistor there should be 12 volts when the ing is turned on.

The other side of the resistor will go to the positive side of the coil, there is one other wire that maybe connected either at the resistor or the positive side of the coil and that the ballast resistor bypass circuit.

This wire only has 12 volts on it when you turn the key to crank the engine, this supplies 12 volts straight to the coil when cranking only, (gives a better spark when cranking the engine).

Hope this helps.

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