Alternator wiring

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Will_Swe

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Hi everybody!
I’m in the last stages of my 318 magnum swap, Valiant 1969 originally slant six.

I’m about to wire up the alternator, but don’t know how to wire it. I want to use the magnum alternator. I have put in a 3 gauge positive cable to battery, but the rest? How do I hook it up properly?

thx in advance// William from Sweden.
 
Easy. The late model alternators have two field wires the same as any other 70/ later Mopar alternator

If you are using the 70 / later VR, just hook it up as if it was a stock '70 alternator

If you are using the 69/ earlier VR ground either of the alternator field connections, then hook your green VR wire up to the remaining one.

These terminals vary. One some they are small stud and nut terminals, and on others they are a proprietary push on factory connector
 
Will_Swe said:
Hi everybody!
I’m in the last stages of my 318 magnum swap, Valiant 1969 originally slant six.

I’m about to wire up the alternator, but don’t know how to wire it. I want to use the magnum alternator. I have put in a 3 gauge positive cable to battery, but the rest? How do I hook it up properly?

thx in advance// William from Sweden.
Click to expand...
3 ga is more than enough for the starter. 6 ga was factory.
The more important wire is the lead from the battery terminal to the starter relay. '69 was either 12 or 10 ga, and I would chose 10 if given the option.

Now. How to wire the alternator.
a. I don't know what alternator came on the magnum you have. My guess, and its just a guess, is that its a "revised squareback".
Post a photo or search for revised squareback to see if the alternator looks the same.
For a revised squareback, using the voltage regulator that was originally meant for that alternator would be a good idea. It will be able to handle the higher current that rotor can draw. It uses a ground controlling regulator so it needs two changes from a '69 wiring scheme.
1. The regulator feed must also feed one of the alternator's brush terminals.
2. The second brush terminal on the alternator must connect to the regulator's second terminal.

Your factory 69 V charging circuit looks like this.
upload_2020-8-1_9-33-10.png


A revised squareback will have a regulator that works like this:
upload_2020-8-1_9-45-18.png
 
Thanh you very much! Very helpful! Im gonna check the alternator tomorrow! :)

I put a 3 gauge from alternator. I have a lot of power consumers, fuel pumps, cooling fans, fuel injection and a total of 2000 WRMS amplifiers.. so i need a good charging system. :)
 
Will_Swe said:
Thanh you very much! Very helpful! Im gonna check the alternator tomorrow! :)

I put a 3 gauge from alternator. I have a lot of power consumers, fuel pumps, cooling fans, fuel injection and a total of 2000 WRMS amplifiers.. so i need a good charging system. :)
Click to expand...
OK. Yes if there is large draw from the alternator then a large output wire from the alternator makes sense. Although 3 ga is very large I assume you have looked at temperature and load charts or calculators and know all this.
And I'll also assume that you've changed from the factory wiring strategy to something that will accomadeate high loads on both the battery and the alternator feeds.

There were other alternators after the revised squareback which I'm not as familiar with. But for those sorts of low rpm loads you might also want to consider a nipodenso (aka Denso). Andy_F was/is making brackets for adapting them to earlier engines.
 
Yeah, the 3 gauge was large.. But choosed between 3 or 5 gauge at the store, 3 made more sense.

Rest of system is good, not much of factory wiring left, most was old and needed more modern solutions, also the car had a lot of owners making their own fixes through the years. 22 owners.. Like most cars over here... i ripped out 65 meters of old cable when i bought the car, guess like around 200 feet cables that been put in to "fix" problems... Saved alot of weight there...
It was once a swedish police car with alot of weird extras..
 
on the Square back alternator does it make any difference where I plug the Fld wires into I can find no marking differences on the alternator as to which wire goes to which plug?
 
NO does not matter. However, lots of these seem to have problems, especially rebuilts. Before you run it, CHECK each field terminal to the case. Should NOT show a short to case. SHOULD show "infinity" or open
 
67Dart273 said:
NO does not matter. However, lots of these seem to have problems, especially rebuilts. Before you run it, CHECK each field terminal to the case. Should NOT show a short to case. SHOULD show "infinity" or open
Click to expand...
OK thanks I'll get my meter and make sure none of the lugs are shorted to the case then
 
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