1971 1210 pickup


Golden Jubilee
Golden Jubilee

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Location: Lyman, IA

Post Thu Oct 27, 2016 9:05 am

Re: 1971 1210 pickup

Like I said, there are only two basic circuits but how they are regulated can get complex, I don't know what you are looking at on Amazon so can't comment.
Rather than cut or re-wire willy nilly. dope out what you have now. Field must alsway go to field. If the R terminal is not used on the alternator, than some other way of determining when to switch on the alternator is used . Ign feed is a common way.
Term 2 is what open an closes the relay, tem 3 gets connected to term 4 when the relay closes, and is used to feed the field and operate the regulator. On a truck without a "charge light" term 4 can be used for things that you want power for only when the engine is running, like an electric (or electric assist) choke. You don't want to connect a heavy load directly to terminal 4 as it would have an effect on what the regulator "sees' as system voltage, but it may be used to trigger another relay for heavier loads. I don't have diagrams for your truck so don't know for sure what was done.

Rookie
Rookie

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Post Thu Oct 27, 2016 7:46 pm

Re: 1971 1210 pickup

The truck in question does have an ammeter. I could therefore get a 2 terminal Chrysler style regulator. However it seems pricing for the 2 terminal regulators listed for various 60's Chryler vehicles was in the high double digits. Those 4 terminal Standard brand regulators are available for $22 at one site. So I'd be inclined to go that route. So the IGN would now go to terminal 2 which when switched on would close the field relay contacts and send battery voltage from terminal 3 to terminal 4 (within the regulator wiring itself) and thus create the path for battery voltage to the field terminal without passing through the ignition circuit itself. Now where in this system is the ammeter? I need to find the diagram showing the ammeter location, or I'll draw that diagram as I ring it out, hopefully. I do nothing willy nilly and am frequently accused of overthinking things which is arguably possible but I personally like to think things through. I'm thankful for your patient guidance Cornbinder.

Golden Jubilee
Golden Jubilee

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Location: Lyman, IA

Post Thu Oct 27, 2016 8:34 pm

Re: 1971 1210 pickup

goggle is my friend. A VR101 Standard voltage reg for 60's Chry is $16.73. Having said that, I would rather fix what it has.
The ammeter should be in the main battery feed before any load. Most often the battery feed is taken from the starter solenoid or the battery itself.
Your wiring plan sounds right. you would need a good battery feed to terminal 3 for it to work.

Rookie
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Post Fri Oct 28, 2016 12:45 pm

Re: 1971 1210 pickup

I've downloaded some circuit diagrams for ammeters and I see the ammeter is in the primary lead to the ignition switch and before any vehicle loads with the alternator output or BAT terminal lead connected to the same terminal as the ignition switch. I just went and found my owner's mahal for my International Palwer Marine Power M-265 as I remember it's beautifully simple motor electrical system diagram and the answers are there. I guess I'm ready to take a ride up to spend a little time with sis on her truck. Thanks to all again and I'll report back.

Rusty Driver
Rusty Driver

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Joined: Fri Nov 30, 2012 2:04 am

Post Tue Nov 01, 2016 1:55 am

Re: 1971 1210 pickup

Pfmet, one thing I have done is buy a photo-copied service manual for my trucks. They usually run just over $100 from places like Binder Planet or SuperScoutSpecialists but to me, it is money well spent. I looked up your charging circuit for 1972 model trucks, and the manual shows 2 wires coming from the alternator plus a battery cable. The book calls the battery cable circuit 2-10, meaning it is circuit 2, 10 gauge wire. This circuit goes to the negative terminal of the ammeter, where it connects with 3 other circuits. The positive ammeter terminal goes to the starter solenoid battery post.Circuit 7-16 goes to the B terminal of the starter solenoid, and circuit 1-24 goes to the ignition switch. Hopefully, your wires are still marked with the numbers. I hope the wiring for a 72 model truck is the same as your 71. Please post if this helps. Bill

Golden Jubilee
Golden Jubilee

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Post Tue Nov 01, 2016 10:35 am

Re: 1971 1210 pickup

One thing nice about IHC, they number the circuits the same if it was a pick-up or a semi. #11 should be ground, so if one of the wires listed has that number it will be a ground between the reg and alternator.

Rookie
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Post Sat Nov 05, 2016 6:30 pm

Re: 1971 1210 pickup

Got to sis's Tuesday and found the wiring to be just as Cornbinder89 had suggested. I pulled all connections and grounds particularly to clean and ring things out, so contacts were now good. So I was getting voltage to terminal 3 from BAT on starter solenoid, terminal 2 is IGN. Terminal 4 has a condenser which is clamped down to one of the regulator mounting screw along with the GRD from the alternator. See photo, sorry about quality. Ultimately the regulator was replaced as the field relay coil was not making the contact despite get power when the IGN was on. And thanks for piping in Bill, the ammeter wiring traced out as your diagram had indicated. And I'm full on with you on the manuals. They're awfully expensive though. I keep thinking I'll find one to download but I'm sure I'll need to buy one.
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Golden Jubilee
Golden Jubilee

Posts: 5170

Joined: Thu Nov 29, 2012 9:28 pm

Location: Lyman, IA

Post Sat Nov 05, 2016 7:10 pm

Re: 1971 1210 pickup

Glad you got it sorted out. I was wondering how you made out.

Freshly Restored
Freshly Restored

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Location: Edmonton, Alberta

Post Sun Nov 06, 2016 9:25 am

Re: 1971 1210 pickup

the parts manual at least is available at the following link, look under MT124. (not my website)

https://app.box.com/shared/otkihx6yoa/2/26460540

Rusty Driver
Rusty Driver

Posts: 125

Joined: Fri Nov 30, 2012 2:04 am

Post Mon Nov 07, 2016 2:52 am

Re: 1971 1210 pickup

pfmet, your sister's truck looks like my 1969 1100 model except for the paint job, mine is copper colored. What happened to the master cylinder line for the front brakes, if you don't mind me asking? Bill
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