I am working on a '69 85hp Johnson that is not getting any spark. When I initially started testing the engine I would hold the plugs close to the block and not get spark. Oddly though the engine started right up after re-inserting the plugs. Since that day the engine will not start. I followed the instructions in a diferent post about wiring a battery straight to the purple wire and grounding out the black and white wire to test the amp. I got a good spark from this test but all the others seem to fail. I tried the light bulb test I read about here and tested for the 250 volts when cranking the engine. Doe this mean the amp is bad? <br /><br />Thanks