Is this a W terminal alternator?

[Dakotakid]

I ran Motorolas for hundreds of thousands of miles and rarely ever had bearings or brushes wear out. I found them to be much more reliable than the Bosch, hands down, on either diesel or gasoline. I owned Bosch the whole time and kept one under the seat just in case I needed it.......rarely did. And, my 82 Jetta had 435,000 miles on it. I have no idea what this other guy is taking about.

I continue to run a Motorola on one of my gas cars....never a problem.
I also have a Motorola on the last tractor I own......2510 John Deere.....and that alt. has only needed attention twice in 9800 hours.

There, how is that for reliability?

[92EcoDiesel Jetta]

I ran Motorolas for hundreds of thousands of miles and rarely ever had bearings or brushes wear out. I found them to be much more reliable than the Bosch, hands down, on either diesel or gasoline. I owned Bosch the whole time and kept one under the seat just in case I needed it.......rarely did. And, my 82 Jetta had 435,000 miles on it. I have no idea what this other guy is taking about.

I continue to run a Motorola on one of my gas cars....never a problem.
I also have a Motorola on the last tractor I own......2510 John Deere.....and that alt. has only needed attention twice in 9800 hours.

There, how is that for reliability?

OK I feel better now. The bearings on mine still feels fine, the brushes are on the short side but serviceable. I like to get an extra set of Motorola brushes and a regulator to keep in the Caddy as spares. Anyone have what I'm looking for?

[92EcoDiesel Jetta]

i hope you have put it in the right spot, other wise you could potentially be supply the tachs w terminal with un regulated voltage, to create a w terminal i believe you want to tap into just one of the three black wires.

I am 99.9% sure I put it in the right spot, having ohmed out the diodes to D+, B+ and gnd. Those 3 black wires terminates to the diode pack, one of which goes to the spot where I soldered to. I did not want to cut into the black wires nor remove the diode pack for fear of damaging the wires since they are old and stiff, so soldering at that spot seems to be least intrusive.

Shouldn't the W terminal be un-regulated AC, coming off one of the 3 phase windings before they are full wave rectified?  

[RabbitJockey]

U got it

[92EcoDiesel Jetta]

Installed modded W terminal alternator into the Caddy and checked it out with a DVM on both AC and DC scales. Alternator is charging fine @ 14 VDC. The W terminal measured 7.5 V AC which as I recall, is the same as the OE W terminal alternator on my 92 Eco so the W terminal mod I made is working. Have not hooked up the modded W terminal gasser tach yet but that'll be next.

[92EcoDiesel Jetta]

Installed the cluster with the W terminal modded tach board hanging out so I can adjust it. I calibrated it with a phototach at 1000, 2000, and 3000 RPM and it appears to be accurate enough. This tach board is actually from a CE1 gasser tach. The Westmoreland tach that I started with didn't work for some reason after modification. I will go back to it and try again ( I think I screwed up by leaving a capacitor out).

CLICK TO PLAY!

[TylerDurden]

That's nice.   

[R.O.R-2.0]

I ran Motorolas for hundreds of thousands of miles and rarely ever had bearings or brushes wear out. I found them to be much more reliable than the Bosch, hands down, on either diesel or gasoline. I owned Bosch the whole time and kept one under the seat just in case I needed it.......rarely did. And, my 82 Jetta had 435,000 miles on it. I have no idea what this other guy is taking about.

I continue to run a Motorola on one of my gas cars....never a problem.
I also have a Motorola on the last tractor I own......2510 John Deere.....and that alt. has only needed attention twice in 9800 hours.

There, how is that for reliability?

my results were 100% backwards of yours...