Re: Firing order and cylinder layout

Posted by HH56 On 2013/2/22 23:18:31

Assuming the wire between coil and distributor is OK, then a quick way to rule out a short is to place a voltmeter between the coil terminal going to the distributor or the distributor terminal itself and ground. With ignition on, if points are open you should read 6v. If points are closed, 0v.

Move the engine a bit so the points either open or close and verify the voltage changes. If it never goes off 6v something is either not connected or not letting the points close to ground. If it never leaves 0v something is shorted. If you have an OD, the ign cutout has also been known to act up shorting the ignition.

If the voltage at coil supply side drops much below 5 volts when cranking, the battery may be weak. When that happens the coil can't supply a sufficient spark.