12 volt condensor

[motto (RIP)]

Condensers are not specified in Volts, they are specified in Micro-Farads which is a measure of storage capacity.

The easy check for condenser compatibility is to observe what sort of a spark the ignition system is putting out. This can be done statically by removing the distributor cap and flicking the points open with a finger nail whilst holding the end of the king lead from the coil that normally plugs into the centre of the cap close to any metallic part of the engine. You should have a fat blue spark that will jump at least 3/8 of an inch. Watch out for Shocko if you have a weak heart.

The spark can also be checked with the engine running by removing one plug lead, starting the engine and once again holding the end near a metallic part of the engine. Depending on what sort of end is on the lead you may have to insert a bolt as an electrode.

The problem you are having may in fact be your plug leads if they are of the silicon type. They are good when they are new but can break down internally and give lots of trouble.

David