Alt upgrade/Problems

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Alt upgrade/Problems

Post  Tore on September 13th 2014, 8:13 pm

I want to remove the factory alternator set up in my 71 Torino and go with an internal regulated 1 wire deal.

Do I just remove the old set up and ext regulator and run a hot wire from the stud on the back of the alt to the hot side of the solenoid???


Thanks Tore


Last edited by Tore on September 17th 2014, 8:50 pm; edited 1 time in total
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Re: Alt upgrade/Problems

Post  res0rli9 on September 13th 2014, 8:47 pm

Run the alt.wire to the + Hot side of batt.

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Re: Alt upgrade/Problems

Post  Tore on September 13th 2014, 8:58 pm

Why can't you run it to the hot side of the solenoid where the battery wire runs to. I have the battery in the trunk,just trying to save some work,
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Re: Alt upgrade/Problems

Post  kim on September 13th 2014, 9:02 pm

Do you have a cut off switch?  Wire from alternator has to go to the battery side of the cut off switch or directly to the posotive battery post.  Anything engine side of the cut off switch and the cut off switch will be disabled.

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Re: Alt upgrade/Problems

Post  69F100 on September 13th 2014, 9:06 pm

[quote="Tore"]Why can't you run it to the hot side of the solenoid where the battery wire runs to. I have the battery in the trunk,just trying to save some work,[/quote

Yes it will work on the hot side that goes to the battery
Put one on a 71 f100 back about a month ago and that is how i hooked it up
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Re: Alt upgrade/Problems

Post  Tore on September 14th 2014, 12:54 pm

Thanks Guys Tore
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Re: Alt upgrade/Problems

Post  DFI429 on September 14th 2014, 1:08 pm

kim wrote:Do you have a cut off switch?  Wire from alternator has to go to the battery side of the cut off switch or directly to the posotive battery post.  Anything engine side of the cut off switch and the cut off switch will be disabled.

Just keep this in mind ^^^   If you wire the alternator in ahead of a cutoff switch, the alternator will keep everything powered even when someone throws the cutoff switch trying to save yer butt Shocked
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Re: Alt upgrade/Problems

Post  Tore on September 17th 2014, 8:54 pm

Guys I have a problem. I have a good alt single wire. I ran the wire back to the cut-off switch and I put meter on to check for a charge. No charge. So I switched post on the cut-off switch same thing no charge. Its a 2 post cut-off switch. MY meter is good, My wire, alt,grounds are all good.
Any ideas why it is not showing a charge??? This is beginning to be a pain in the ass!


Thanks Tore
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Re: Alt upgrade/Problems

Post  the Coug on September 18th 2014, 8:34 am

Tore some of those alts have an exciter post which has to have power to it.... just saying...
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Re: Alt upgrade/Problems

Post  Tore on September 18th 2014, 8:42 am

the Coug wrote:Tore some of those alts have an exciter post which has to have power to it.... just saying...

I had heard something like that before but never knew what it was. But I took the alt to 2 places for them to check it out and they said it worked fine.

The pulley on the crank is about 7" in dia and the pulley on the alt is a Moroso Alt oversize pulley. Probably about 8" in Dia. Can it be spinning to slow at idle for me to get a reading????
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Re: Alt upgrade/Problems

Post  the Coug on September 18th 2014, 10:09 am

Tore if this is not a race only car I would use the smaller alt pulley you may not be spinning it fast enough to charge, most of the slower pulleys for the alt that I have worked with are only about 4 inches in dia...
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Re: Alt upgrade/Problems

Post  Tore on September 18th 2014, 10:29 am

the Coug wrote:Tore if this is not a race only car I would use the smaller alt pulley you may not be spinning it fast enough to charge, most of the slower pulleys for the alt that I have worked with are only about 4 inches in dia...

Its a street car. But I can't figure out why at idle its not showing a charge.

I am going disconnect the alt wire tonight and get a different battery and set it outside the car and hook the alt hot lead to battery and hook a ground wire from the car to the other battery and fire the car and see what happens. It should show a charge.

I also thought about the larger pulley to take that off also and try.


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Re: Alt upgrade/Problems

Post  bbf-falcon on September 18th 2014, 11:48 am

Tore,as you well know,these things can be a pita,almost as bad as a Jack Russell hound.lol

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Re: Alt upgrade/Problems

Post  Tore on September 18th 2014, 12:00 pm

Yes he pissed in my shoe Shocked  yesteday as I had them out side trying to dry the mud off them!
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Re: Alt upgrade/Problems

Post  Dave C. on September 18th 2014, 12:20 pm

I did the same thing you did , big pulley and all. Like Coug stated, it wont charge at low RPM .. gotta keep the exciter excited.

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Re: Alt upgrade/Problems

Post  dirt_worker on September 18th 2014, 12:47 pm

Sounds like your pulley ratio is way off...
Powermaster recommends a 3:1 ratio for street vehicle's.Youre actually spinning it slower than the crankshaft w the pully sizes you posted.

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Re: Alt upgrade/Problems

Post  dirt_worker on September 18th 2014, 1:16 pm

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Re: Alt upgrade/Problems

Post  Tore on September 18th 2014, 2:31 pm

dirt_worker wrote:Sounds like your pulley ratio is way off...
Powermaster recommends a 3:1 ratio for street vehicle's.Youre actually spinning it slower than the crankshaft w the pully sizes you posted.


I am headed home in a bit to change the pulley and will post results.



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Re: Alt upgrade/Problems

Post  Tore on September 18th 2014, 7:41 pm

Tore wrote:
dirt_worker wrote:Sounds like your pulley ratio is way off...
Powermaster recommends a 3:1 ratio for street vehicle's.Youre actually spinning it slower than the crankshaft w the pully sizes you posted.


I am headed home in a bit to change the pulley and will post results.

It was the large dia alternator pulley. Put the stk one on and it was charging.

Thanks Guys Tore



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Re: Alt upgrade/Problems

Post  Dave C. on September 19th 2014, 12:02 am

That's exciting !

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Re: Alt upgrade/Problems

Post  BOSS 429 on September 19th 2014, 8:41 am

Tore wrote:I want to remove the factory alternator set up in my 71 Torino and go with an internal regulated 1 wire deal.

Do I just remove the old set up and ext regulator and run a hot wire from the stud on the back of the alt to the hot side of the solenoid???


Thanks Tore



call MAR'S inc. in DeKalb, il.

they sell a 1 wire kit that turns the early ford alts into a 1 wire deal. 
works perfect,it also has a adjustable reg in it so you can turn it up. less then $50.00 last time I bought one

tell em I sent ya

all you do to the car is unplug the reg,then later you can always go back the other way.
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Re: Alt upgrade/Problems

Post  bbf-falcon on September 19th 2014, 10:03 am

Thats a good route to go. Thx Rich

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Re: Alt upgrade/Problems

Post  dirt_worker on September 20th 2014, 1:15 pm

Glad you got it figured out.
I believe most all the 1wire alternators need to see a certain rpm to "turn on". Sounds like the underdriven pulleys didnt allow the regulator to become excited.
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Re: Alt upgrade/Problems

Post  IDT-572 on September 21st 2014, 12:05 am

The rpm in which the one wire alt start to charge can be changed by finding a rotor and field that has the closest clearance between the two. The tighter the clearance the lower the rpm will be when it begins to charge.


Last edited by IDT-572 on September 26th 2014, 2:13 pm; edited 1 time in total
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Re: Alt upgrade/Problems

Post  Tore on September 21st 2014, 9:37 am

Thanks for the help guys.


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