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Old 05-31-2008, 10:16 AM
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Ford 300 Voltage regulator

This sounds dumb i know, but i can't find anybody to tell me how to hook up a voltage regulator to a 73 Ford 300 six.. It is in a bare frame, basically, no wiring at all. I need to just hook up the alternator, the stock four lead voltage regulator and an ammeter. Had three different people who are supposed to know what they are doing, and all we have done is trade the alternator three times.

No charge showing on the ammeter, and the engine stops when i take the battery hot wire off.

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Old 05-31-2008, 01:49 PM
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Moving to the Electrical forum........
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Old 06-01-2008, 03:16 AM
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Quote:
Originally Posted by wishnevsky

This sounds dumb i know, but i can't find anybody to tell me how to hook up a voltage regulator to a 73 Ford 300 six.. It is in a bare frame, basically, no wiring at all. I need to just hook up the alternator, the stock four lead voltage regulator and an ammeter. Had three different people who are supposed to know what they are doing, and all we have done is trade the alternator three times.

No charge showing on the ammeter, and the engine stops when i take the battery hot wire off.
Do not pull the BAT cable while the engine is running. The resultant voltage spikes can damage the complete system.

Use the lower illustration-
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Old 06-01-2008, 07:15 AM
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ok that is better.. i have a red, a blue, and a white terminal on the alternator. any idea what they are?
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Old 06-01-2008, 07:29 AM
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Old 06-01-2008, 08:01 AM
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ok thanks.. i'll see what i can mess up this time..
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Old 06-01-2008, 09:10 AM
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Since you stated you were using an ammeter, consult an old Motors manual from the later 60s through the 70s or so. They will show two diagrams for Ford charging system wiring, one for a car with a gauge and the other for just an idiot light. Depending upon which, there are some differences in the wiring between the alternator and the regulator. Very simple either way, though. Good luck.
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Old 06-01-2008, 09:23 AM
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I have a 75 chilton, but it assumes that the old wiring is there. i have the ford six in a stripped toyota frame, so i am starting from scratch.. It cant be too hard, but three experts have come up empty..
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Old 06-01-2008, 09:42 AM
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Quote:
Originally Posted by wishnevsky
I have a 75 chilton, but it assumes that the old wiring is there. i have the ford six in a stripped toyota frame, so i am starting from scratch.. It cant be too hard, but three experts have come up empty..
Your library may have the older Motors manuals or an old, established garage will. It's a very simple diagram that you could manually copy onto a piece of paper in a couple of minutes.
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Old 06-01-2008, 09:48 AM
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From Autozone

1976 - 1986 F150 w/ 300 6-banger
This particular diagram appears to be for a 76 - 78 w/ idiot light. (alternator indicator)

All Fords used the same external volt reg from about '65 right on up thru the mid-80's. The electronic regulator replaced the mechanical type ... and a repair harness that plugs into the reg is available at almost any parts store.
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Old 06-01-2008, 09:53 AM
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i was planning to buy a harness from painless or summit, but i dont see that they have the alternator link.. but this ought to work.. It runs now, i just have to get it streetable this next month.
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Old 06-01-2008, 10:00 AM
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Thinking about it ... I believe that an AMMETER should be wired in between the "A+" and the starter relay, as it measures current flow.

The "I" terminal is just a "switch" that turns off a light while the alternator is producing a charging current ... right?
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Old 06-01-2008, 10:11 AM
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Quote:
Originally Posted by 66GMC

The "I" terminal is just a "switch" that turns off a light while the alternator is producing a charging current ... right?
Correct, it isn't used when running an ammeter.
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