Re: residual spark only :amplifier or rectifier?
Does sound like your amp's OK & that you have a problem with the signal that triggers it.<br /><br />Those systems are real easy to debug. Might be tougher to follow my fractured prose, so ask questions if it sounds unclear.<br /><br />You've got 4 wires going to the amplifier. 1 Red or purple is 12V+ power supply to the amp. 2 Black with white stripe is lead to a pair of points sitting under your flywheel. 3 Blue is 'output' juice to your coil, timed properly and peaking at (something like) 150V. 4 Gray is the lead for a tach, optional if you have one, we'll ignore #4.<br /><br />Find your coil (up above the amp), and disconnect the fat black spark lead leading under the flywheel. Borrow another plug wire from somewhere, and attach it at the coil. Pop a plug in the far end of the plug wire, and ground the body so you can see if it sparks.<br /><br />Are you sure you disconnected the spark lead going under the flywheel? OK - turn your ignition key "on". This should apply 12V to the #1 lead, and you can check with a voltmeter if you have one. The voltage should stay above 10.5V even while cranking. <br /><br />The #2 lead should switch back and forth between open and closed circuit to ground, the flywheel turns. [(WARNING: When you turn the flywheel, the motor may start & cause you serious injury or death.) Only turn the flywheel clockwise (looking down from above), the way your motor normally turns, or you may hurt your water pump.]<br /><br />If you have a volt-ohm meter, you can check whether the points (#2 lead) are functioning as they should. You can also just disconnect this lead, and while the key is on, tap the lead against the block a few times, grounding it. You should see a spark at your plug each time you ground it. When the motor is running, each time the points open (go from closed to open circuit) you get a spark. When you turn the key off, you are cutting power to the white/black lead, and the amplifier fires - that's why you're getting a spark then.<br /><br />Rapair's website & other places have good sections on debugging these - try a search on "battery CD" and "OMC".<br /><br />Post back if this sounds unclear. Have fun!
