Re: 504 distributer fried from wiring mistake?plea

Posted by Bob M on June 25, 2004 at 06:49:51 from (165.170.128.66):

In Reply to: 504 distributer fried from wiring mistake?please H posted by Randy on June 25, 2004 at 05:45:52:

Randy - Except perhaps for a direct hit by lightning it’s pretty hard to ruin a distributor or the plug wires! As long as the points are installed correctly and the contacts are clean, problem’s gotta be somewhere else. You might proceed like this:

1 – Temporarily block the breaker points open - stick a clean business card, dollar bill or similar between the contacts. Now turn on the ignition and check for voltage between each coil primary terminal and ground. You should see battery voltage to ground at BOTH coil terminals.

If voltage appears at the + terminal only, the coil is bad. If you see no voltage at both terminals check for bad wiring harness, burned-out ballast resistor (if there is one), bad ignition switch, etc. If you see voltage at both terminals go to the next step.

2 – Pull the center wire from the distributor cap. Stick a good spark plug on the end of the wire then lay the plug on grounded metal. Now turn on the ignition and manually work the ignition points open and closed. You should get a fat spark at the plug each time you open the points

If you don’t get a spark suspect a bad coil (or possibly a bad condenser). If you get a good spark go to #3.

3 – Problem’s gotta be ignition timing. Check the plug wires are installed in the correct order on the distributor cap. Set the crank to #1 TDC (#1 cylinder firing) then verify the distributor rotor is under the cap’s #1 plug wire nipple.

Hope this helps...

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