Hello, I have an 87 century with a 230/v8 merc with a tbolt4 ignition, when tested, I have 10 volts at the pos. side of the coil. I have replaced the coil, sensor,battery, wires, plugs,alternator,distrib. cap and rotor, ignition switch. oil and filter, oil/water seperator, fuel filter. When I remove the wire from the pos. side of the coil, it has 12 volts,the ign. switch then has 12 volts, as soon as I reconnect the tbolt4 to the coil it drops to 10 volts and wont start. Sometimes it will read 12 volts and then it will start and run no problem. As you can tell I am no mechanic, but before I replaced the tbolt4 which is kind of pricey I was hoping you could help. Thank you <br />CC
