Re: 1951 ford 8n has no fire

Posted by Janicholson on December 02, 2022 at 18:41:33 from (24.240.46.228):

In Reply to: 1951 ford 8n has no fire posted by Cowboyallen folse on December 02, 2022 at 17:16:41:

Some ideas: Coils do not have resistors in them. They are designed to live on the voltage provided by the battery, or some are designed to operate with a resistor in the wire from the ignition switch. This second type can allow the use of a 6 volt coil on a 12 volt system. The reason to do that is to allow a circuit to bypass the resistor when starting, giving the coil more volts while the starter is operating.
Testing should begin with determining where the voltage is stopped. So, to examine circuits a test light is needed. These allow the user to follow tractor (or car/truck) electrical circuits. The test light is connected to the vehicle battery. (assuming it is the one shown in the link) the black is hooked to the negative battery post, the red to the positive. The ignition (push/pull) switch common on those tractors should have a supply of voltage at all times. This voltage usually comes from a connection at the starter, or a connection at an amp gauge (if it has one). So checking the switch (from under the dash/hood) for voltage to one terminal, with the switch off indicates available power to the switch. If neither switch terminal has power the supply source is the problem, trace the wires to find it. If power is there, turn the switch on. There should be power to both switch terminals now. if not the switch is bad. If power is on both, next go to the coil. There are two small terminals, and the main spark terminal. One small terminal has a wire going to the distributor, the opposite one is from the switch. If there is no voltage there, the wire to the switch is bad, or its connections. If power is there, the next test is to check power on the other small terminal (switch still on). If power there you know the coil is getting voltage, but there is potentially a different issue. The distributor points make and break contact with ground for every spark. Most 4 cylinder engines stop with the points closed, If closed, the wire going to the distributor is grounded, and the result is no voltage will be seen at the coil (in the second coil test). If the points are open, or held open with a plastic knife blade, there should be power at the coil terminal connected to the distributor. If the points are open as is, rotate the engine (safely in neutral) until the points are closed. Now there should be no power at the distributor side of the coil. If there is still power, the points are not conducting and need to be cleaned, filed, or replaced. The condenser in there with the points should be OK, few go bad, but if it is, disconnecting it and repeating the tests should point to that as a problem. Look up Kettering Ignition systems to study what I have described. Keep in touch and we can further assist. Jim

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