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Old 01-09-2013, 06:55 PM
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wiring questions

72 chevy c30

2 questions:

I am trying to wire an alternator to an already direct ignition switch to battery to starter. My alternator does not have an 1-2 labeling. I believe it has an F and R letters. Which letter do I wire up to the ignition switch and what area on ignition switch should I install it on? Batt, starter, acc?

I am also trying to install an ammeter.

In what configuration do I install the ammeter? Starter, ignition switch?

Apologies if I do t have the appropriate wording.

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Old 01-09-2013, 07:54 PM
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maybe this can help.
Catalog
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Old 01-09-2013, 07:59 PM
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Depending on if your truck is wired for a external regulated alt or an internal regulated alt.

if it's wired for a internal regulated alt or converted to an internal regulated alt, here's how it should be wired.

The number 2 terminal is the "F" terminal.

Terminal #1 from the alt goes to the one side of the idiot light on the dash. The other side of the idiot light goes to a switched 12v source (hot when the key is in the run position) This is the exciter wire and tells the alt to start producing juice. The idiot light does not get a ground wire, it gets a ground from the internal regulator in the alt when the alt isn't spinning. That's why it lights when the key is turned to run but the engine isn't running, and it goes out when the engine starts. You don't have to run an idiot light but why not have a fault indicator, if you choose not to run the light you need to provide the 12v, in run, to the #1 terminal.

Terminal #2 or "F" from the alt goes to the hot side of the wiring system, normally itís spliced into the hot feed leading to the fuse box. This is the sense wire, it tells the alt to produce more or less juice depending on the demands of your electrical system.

The large stud on the back of the alt is the output and is tied directly to the battery with a large battery cable. Sometimes it's routed from the alt to the starter lug then to the pos battery post.

Second question...... I would not run a ammeter use a volt meter instead much easier to wire.... basicly hook one side of the volt meter to ground and the other side to a switched 12v and that's about it, depending on the meter but most are like that.
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Old 01-09-2013, 08:09 PM
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I'm not running through the trucks factory installed wiring.

Would what you wrote me still be valid?
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Old 01-10-2013, 03:48 AM
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Yes wires are wires, you need to make sure you use the correct guage of wire.

8 or 10 gage for the wire feeding the fuse box
14 gage for the wire on terminals 1 and 2
2 gage for the battery to starter
8 gage for the wire from the alt output lug to the battery
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