Duanes - If your 400 has have a Delco internally-regulated alternator procede as below. (Otherwise just disregard....!)
1 - Take voltage readings at the following points (all voltages measured to ground):
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The large post ("BAT") terminal - should read battery voltage.
Now pull the auxiliary wiring connector from the alternator and take readings at the connector. With the ign switch "off" you should see 0 volts at #1 and battery voltage at #2.
With the ignition switch "on" you should see battery voltage at BOTH terminals.
If you don't get the above results the alt is wired wrong, or there's an open diode (or blown indicator lamp if equipped) in the #1 circuit.
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2 - If wiring checks out OK, next test the alternator:
Start and run the engine at about 1/2 throttle. Now with an assistant observing the ammeter, find the "D" shaped hole in the back of the alt (photo above...), take a small screwdriver poke it into the hole until it touches the metal test tab inside then ground the side of the screwdriver against the metal case. If the ammeter indicates full charge with the test tab grounded, the internal regulator is bad and needs to be replaced. However if there's still no charge the alternator is N.G. - time for a replacement!
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Today's Featured Article - Product Review: Storm Covers - by Staff. We recently had a chance to try out the new Storm Cover for the Ford 9N, 2N and 8N tractor that is now being re-introduced to a new generation of Ford N-Series tractor owners. Originally produced more than 40 years ago, it is now enjoying a reproduction run that has been licensed by the Ford Motor Company. An original storm cover was used for the pattern, and this reproduction cover is indeed exactly as the original (of which we had previously only seen pictures of in miscellaneous old sale
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