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Old 10-14-2014, 02:05 PM
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Default Alternator Wiring - 3 wire - '64 40

Howdy,

Subject: 1964 FJ40 (Keith's)

Part in question: Alternator wiring

Okie Dokie folks. I think this is an easy one but I want to ask... I am not electrical genius...


This rig has a 3 wire alternator. See picture for a representative image of what it has.

This rig also has a simply NAPA ignition switch with 5 positions and 4 posts. (positions: acc, off, acc, run, start) (Posts: acc, run/ignition, 12v power, starter) It only has the starter wire connected to one post, and the accessory and coil wires connected to the run position post. the accessory post is empty.

The alternator sensing wire is bridged to the positive terminal on the back of the alternator (questionable, I know it should be wired to the battery/fuse block) and the field wire WAS connected to the same run post that the coil and accessory wires were connected to.

This was creating a condition where the truck would not shut off reliably since 12v was (I think) bleeding to the coil when the truck was turned off. Now I know the right way to fix it is add a resistor or charge lamp to that field wire and leave it connected to the run post...... BUT I don't have a lamp and want to fix it without buying new little stuff.

SO....

My question is. Can I just hook up the field wire to the accessory post? it is isolated when the key is in the off position and gets 12v when it is in the acc, run, start position.

That works right? If not then I'll add a light and or resistor. In that case what's a good resistor value? I read somewhere 50 ohms. Wattage??
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Last edited by rover67; 10-14-2014 at 02:35 PM.
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Old 10-14-2014, 02:14 PM
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generator or bust!
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Old 10-14-2014, 02:27 PM
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yyeeeeeaahhh I ain't gonna tackle that re-conversion (?) it's not mine...

Did the '64 have a charge light on the dash?
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Old 10-14-2014, 02:34 PM
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maybe it did...

http://www.myfj40.com/Diversions/Clusters#5

right now it has an ammeter and an Oil pressure gauge. Fuel and water temp are missing.
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Old 10-14-2014, 02:38 PM
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ok...fine.... data

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aka Mike D.----->Bio Page KDGWY
He who goes unarmed in paradise had better be sure that that is where he is.James Thurber
"Its better to be thought a fool rather than to speak up and remove all doubt." - Lincoln
pride is ego, the word I had lost was dignity. The quality or state of being worthy of esteem or respect.
Ptarmigan build thread - 95FZJ80
www.root45.com
www.risingsun4x4club.org

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Old 10-14-2014, 02:46 PM
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Quote:
Originally Posted by rover67 View Post
maybe it did...

http://www.myfj40.com/Diversions/Clusters#5

right now it has an ammeter and an Oil pressure gauge. Fuel and water temp are missing.

1964 has an ammeter and oil pressure

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__________________
aka Mike D.----->Bio Page KDGWY
He who goes unarmed in paradise had better be sure that that is where he is.James Thurber
"Its better to be thought a fool rather than to speak up and remove all doubt." - Lincoln
pride is ego, the word I had lost was dignity. The quality or state of being worthy of esteem or respect.
Ptarmigan build thread - 95FZJ80
www.root45.com
www.risingsun4x4club.org

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Old 10-14-2014, 03:09 PM
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wiring diagram for Keith

http://www.risingsun4x4club.org/foru...d=1#post257331
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aka Mike D.----->Bio Page KDGWY
He who goes unarmed in paradise had better be sure that that is where he is.James Thurber
"Its better to be thought a fool rather than to speak up and remove all doubt." - Lincoln
pride is ego, the word I had lost was dignity. The quality or state of being worthy of esteem or respect.
Ptarmigan build thread - 95FZJ80
www.root45.com
www.risingsun4x4club.org

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Old 10-14-2014, 03:16 PM
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i'm so confused Mine is the same as roots meter wise. I think the ammeter and oil lights ended between 62-63
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Old 10-14-2014, 03:38 PM
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Don't run a high amp output alternator through the old Amp meter. Its only rated at 30-40A
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Old 10-14-2014, 04:50 PM
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Quote:
Originally Posted by waggoner5 View Post
Don't run a high amp output alternator through the old Amp meter. Its only rated at 30-40A
I 2nd that. Thats why my 55 harness melted
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