Delco Remy alt.

[wayno]

Hi there Ratsun members, have you seen this alt. before? Is it internally regulated? It was on a J15 engine tranny combo I purchased a while back. I know there is a search funtion, but I have oics.:angel:

[banzai510(hainz)]

IM only guessing ,but asssume its a GM one wire unit.

Look up(google.yahoo ect) GM 1 wire alt and should come up.

[yello620]

Wayno, that is in fact a GM one wire alternator. Shown best in your last pic is a black rubber plug at the 1 and 2 electrical connector spots. Under this plug is where the othertwo wires would normally be connected. And yes they are internally regulated.

 

It is a model 10si or 12si, i need a picture of the front of it to tell.

 

Be prepared to hate this alternator, i have yet to be happy with a GM 10si alternator in any vehicle i had one in.

[ggzilla]

So why does it have four wire connectors?

[wayno]

Wayno, that is in fact a GM one wire alternator. Shown best in your last pic is a black rubber plug at the 1 and 2 electrical connector spots. Under this plug is where the othertwo wires would normally be connected. And yes they are internally regulated.

 

It is a model 10si or 12si, i need a picture of the front of it to tell.

 

Be prepared to hate this alternator, i have yet to be happy with a GM 10si alternator in any vehicle i had one in.

 

 

I removed it from the engine as I have a 1980 720 wiring harness in the project, so i used a early 80s 720 internally regulated datsun/nissan one as it is wired for the harness. All I had to do was make a mount. But this might work for another future project. Here are a few more photos.

[yello620]

So why does it have four wire connectors?

 

 

Maybe you should try looking at it again. Bet you cant find four wire connections.

 

Wayno-that is the 10si model with the one wire kit installed. Easily converted back to a normal. And then you can wire it properly and have it function like it is supposed to and operate your dash light so you know it is working just like stock.

[wayno]

I might use it in a future project, thankyou. It's good to know what it is, is it the better of the two mentioned? Are they the same, worse?

[yello620]

The 10si is the earlier version produced from the early 70's to the mid 80's. And was available in many different amperage ratings, with the highest amperage rated one at 83 amps(i think). I have seen them as low as 35 amps.

 

The 12si is the later version produced from the late 80's and into the early 90's. Also available in many different amperage ratings, but the lowest was in the 70 amp range(IIRC) and the highest was just over 100 amps. The 12si can be upgraded to at least 150 amps if the money was spent to do it.

 

 

The 10si and 12si internal parts will physically interchange, but the cases are different. The reason for the difference in the cases is airflow. The 12si cases and fan assembly are designed for better airflow to cool the extra heat of the higher amperage ratings. The 12si usually has a plastic fan assembly on the front of it.

[ggzilla]

Maybe you should try looking at it again. Bet you cant find four wire connections.

[metalmonkey47]

YES IT IT A 1 WIRE.

 

 

It's an internally regulated GM one wire unit. 45amp output, but still better then the stock alternator.

 

 

I have one sitting in my garage brand new from Autozone. They're pretty cheap, and only cost around $50 at Autozone and come with a lifetime warranty.

 

 

 

I'll take pictures of mine tomorrow for comparison. Don't feel like waking up the parents.

Edited September 9, 2011 by metalmonkey47

[yello620]

 

That was the whole point of making you look again. At 3 and 4 is a rubber plug that covers the holes where the other wires would hook up if it wasnt a one wire conversion..It was a dead giveaway.

[metalmonkey47]

 

 

 

[datsunaholic]

David, the 1-wire alternators are a normal GM alternator with a slightly different regulator that lets them self-start the field. Normal GM SI type alternators will self-start at around 3000 RPM (depends on the pulleys though) but sometimes won't at all. The way to force-start the alternator is to put a low-current load at the field terminal (using the idiot light). The 1-wire has all the same connectors, you just don't need the idiot light to start the field, it self-energizes. However internally they've hooked the Sense terminal to the BATT terminal (which was done externally on a normal SI type alternator).

 

The way that the guys that sell 1-wire converted alternators is they put a cap plug over the Field/Sense terminals so you know you don't need the wires.

 

BTW, that works even with the bigger 12SI alternators. I had the fuse that ran the idiot lights blow out, the main alternator wouldn't work until I got up to around 40MPH then it started charging normally.

[ggzilla]

Ah, that makes sense. Thanks. It has three or four connectors, but only needs one actual connection due to the special regulator.