generic externally regulated alternator connection

[fitterski]

I bought this alternator for my snow-blower's cummins 5.9 12-valve (no internal wiring diagram).

DB Electrical AND71 Alternator (For 94 95 96 97 98 1332), Alternators - Amazon Canada

Not knowing any better (to research and do it myself) I farmed out the hookup to a retired technical school teacher. He tapped out a stator pigtail for a tach signal which subsequently worked (for a while).

Next he piggybacked an unidentifiable electronic external regulator that has 2 wires on it and a grounding tab. He connected battery positive to one of the regulator wires and the one of the alternator field tabs to the other regulator wire. The remaining field tab on the alternator was connected to ground.



The tach quit working so I provisionally bypassed the regulator and connected live battery + to the alternator field tab. The tach now works, I haven't yet checked charging.

I also ordered a new Tru-Tech VR166T regulator (no internal wiring diagram).

While trying to get myself spooled up on the topic I stumbled upon this blurb which seems to contradict all of the above.

https://dodgeforum.com/forum/1st-gen-ram-tech/303000-diy-external-voltage-regulator-conversion.html

If I read this correctly the BATT should connect to the batt tab of the regulator AND to one field tab on the alternator while the other field tab on the alternator should connect to the F tab on the regulator. This suggests that the one filed tab on the alternator receives battery power which then exits via the other field tab to ultimately ground out in the regulator tab.

Can anyone chime in on this? TIA

 

[BertZegers]

I bought this alternator for my snow-blower's cummins 5.9 12-valve (no internal wiring diagram).

DB Electrical AND71 Alternator (For 94 95 96 97 98 1332), Alternators - Amazon Canada

Not knowing any better (to research and do it myself) I farmed out the hookup to a retired technical school teacher. He tapped out a stator pigtail for a tach signal which subsequently worked (for a while).

Next he piggybacked an unidentifiable electronic external regulator that has 2 wires on it and a grounding tab. He connected battery positive to one of the regulator wires and the one of the alternator field tabs to the other regulator wire. The remaining field tab on the alternator was connected to ground.

View attachment 627993

The tach quit working so I provisionally bypassed the regulator and connected live battery + to the alternator field tab. The tach now works, I haven't yet checked charging.

I also ordered a new Tru-Tech VR166T regulator (no internal wiring diagram).

While trying to get myself spooled up on the topic I stumbled upon this blurb which seems to contradict all of the above.

https://dodgeforum.com/forum/1st-gen-ram-tech/303000-diy-external-voltage-regulator-conversion.html

If I read this correctly the BATT should connect to the batt tab of the regulator AND to one field tab on the alternator while the other field tab on the alternator should connect to the F tab on the regulator. This suggests that the one filed tab on the alternator receives battery power which then exits via the other field tab to ultimately ground out in the regulator tab.

Can anyone chime in on this? TIA

I have a Delco Remy service bulletin attached. This is a very common alternator on older equipment, and easy to work on. The regulator is inside this alternator but the bulletin shows you the principle.
The right charging voltage is important. We had a tractor with a bad regulator at work. The gauge showed max voltage. The boss said we look at it when we have finished. Not long after, the operator walked of the field. 2 batteries had exploded and the battery parts had damaged the radiator. Battery acid all over!

 

[fitterski]

I have a Delco Remy service bulletin attached. This is a very common alternator on older equipment, and easy to work on. The regulator is inside this alternator but the bulletin shows you the principle.
The right charging voltage is important. We had a tractor with a bad regulator at work. The gauge showed max voltage. The boss said we look at it when we have finished. Not long after, the operator walked of the field. 2 batteries had exploded and the battery parts had damaged the radiator. Battery acid all over!

Weird, I AGAIN did not get an email thread alert.

Thanks, that's a so called 3-wire alternator. I was advised to buy one with an external regulator because the new electronic ones (internal or external) are easy to blow. Mine probably blew when a battery terminal got unscrewed with the alternator charging, something I had been warned about. I tested it today with no regulator and just unregulated battery powering the field and an unregulated 17vdc charge was the result, which I of course did not leave on )

I'll have to wait to see what kind of docs I get with the new regulator, it's evident now that the 2 field tabs on the alternator are just that, the 2 ends of the field coil, one of which has to be grounded the other powered. What I do not know at this point is if the regulator (presumably F) tab provides modulated output power to one of he field tabs in which case the other tab would only need to be grounded, or if full BATT power goes to one one the field tabs on the alternator and the modulation is still done by the regulator but on the line grounding the field via the other alternator field tab connected to the F tab on the regulator? Also need to know if polarity is important.

Any mechanic used to working with charging systems would know this blindfolded but I only share the latter attribute

Speaking of exploding batteries, did that a while back while welding with 3 in series. The one that blew (it's side, 20 feet away) was fortunately totally dry.

 

[WranglerX]

Internal regulated alternator are no less reliable than external regulated ones...

Internal regulated alternators have been around for years, almost every vehicle manufactured today has internal regulated alternator ..Internal regulated alternators are basically one wire hookup from B+ post to battery... By using external regulated alternator and not knowing how to hook it up just makes life difficult for you....

IF external regulated alternator is off Dodge Ram, just pull appropriate Dodge wiring diagram and wire per diagram, IF you have matching regulator... Not all regulators are created equal........

Dale

 

[RickB]

Internal regulated alternator are no less reliable than external regulated ones...

Internal regulated alternators have been around for years, almost every vehicle manufactured today has internal regulated alternator ..Internal regulated alternators are basically one wire hookup from B+ post to battery... By using external regulated alternator and not knowing how to hook it up just makes life difficult for you....

IF external regulated alternator is off Dodge Ram, just pull appropriate Dodge wiring diagram and wire per diagram, IF you have matching regulator... Not all regulators are created equal........

Dale

I agree with all this except for the claim that internally regulated alternators are one wire hookups. The vast majority of alternators whether internally regulated or not require an excitation circuit usually controlled in some form or fashion by the ignition switch.
All one wire alternators are internally regulated but not all internally regulated alternators are one wire.

 

[aczlan]

I agree with all this except for the claim that internally regulated alternators are one wire hookups. The vast majority of alternators whether internally regulated or not require an excitation circuit usually controlled in some form or fashion by the ignition switch.
All one wire alternators are internally regulated but not all internally regulated alternators are one wire.

I agree, I just put a "3 wire" internally regulated GM 10si alternator in out 1965 David Brown project. 2 wires to the battery connection on the starter and 1 wire to the key switch.

Aaron Z

 

[Imold]

I put this 100 amp one wire on a old ford last year.

 

[fitterski]

Again several replies, I have checked 'subscribe' to be emailed but got none.

I understand that internal/external reliability is similar but if an external one blows you don't need to replace the alternator. Meanwhile I presume that mechanical ones are more reliable. There is a warning (below) to "never disconnect a battery terminal with engine running'. Remember when this WAS the standard way to test an alternator? We probably still doe not need this warning with mechanical ones(?).

I went to the local supplier and the only alternator with a tach-tab he has in stock is 3-wire one for $400cdn (not ready to buy one of those!).

Meanwhile I received the external regulator I ordered. It's electronic and compatible with ford (mechanical or electronic) which I guess is generic enough. Unfortunately ABSOLUTELY NO DOCUMENTATION, it has 4 tabs: I, A, S, F plus a warning note and that is it.

 

[BertZegers]

Again several replies, I have checked 'subscribe' to be emailed but got none.

I understand that internal/external reliability is similar but if an external one blows you don't need to replace the alternator. Meanwhile I presume that mechanical ones are more reliable. There is a warning (below) to "never disconnect a battery terminal with engine running'. Remember when this WAS the standard way to test an alternator? We probably still doe not need this warning with mechanical ones(?).

I went to the local supplier and the only alternator with a tach-tab he has in stock is 3-wire one for $400cdn (not ready to buy one of those!).

Meanwhile I received the external regulator I ordered. It's electronic and compatible with ford (mechanical or electronic) which I guess is generic enough. Unfortunately ABSOLUTELY NO DOCUMENTATION, it has 4 tabs: I, A, S, F plus a warning note and that is it.

I payd CAD $7 for a new internal regulator for a Delco 10 SI at the local automotive store. The Delco 10SI is probably the easiest alternator to work on! No soldering at all.
A tach tab is that not just a connection to one of the stator windings?

The Delco is also available as one wire alternator.

 

[fitterski]

I payd CAD $7 for a new internal regulator for a Delco 10 SI at the local automotive store. The Delco 10SI is probably the easiest alternator to work on! No soldering at all.
A tach tab is that not just a connection to one of the stator windings?
The Delco is also available as one wire alternator.

I had no idea you could just replace an internal regulator as well, that's good to know. Yes, the tach tab would be a connection to the stator pole, that's what's on the existing alternator which right now is neither charging nor driving the tach. Alternators that come with it have a terminal usually labeled "R" (for rpm?). I'll try the new regulator but for now i have more pressing issues.