Question about 2000 Harley Davidson FXSTS Springer Softail
Take your battery out and take it somewhere to have it tested. It sounds like your battery voltage is dropping below 10 volts. I'm curious to know how you discovered that the plugs doesn't fire until you release the starter button. On most of the Twin Cam engines, the engine is equipped with a compression sensor and the plugs will not fire unless the engine has compression. In other words, you can't check for the spark plugs firing like you to do by taking the out and laying them on the cylinder heads.
To check for spark, leave you old plugs in the engine. Get another set of spark plugs and put them in the wires and ground them. Turn the ignition switch on and spin the engine. Check to see if the plugs are firing. I made up a set of "test plugs" that have a short "ground strap" on them with alligator clips to ground them with.
Posted on Oct 07, 2009
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Posted on Jan 02, 2017
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