Help on solenoid R&R

[Gliderjohn]

Bought one for the T-3. Only concern is that my old one only has one spade connector but the new one has two. Which one do I use?
GliderJohn

[guzzisteve]

I used to get Porsche solenoids that had dual spades, I used the one in the same place as stock location. 

[SmithSwede]

I am not familiar with two spade solenoids.  But logic suggests to me that one spade has to be a positive.    Therefore either both spades are positive, or one is positive and the other is negative. 

If you have a voltmeter, check to see if the two spades are electrically identical.  If so, then surely they are both positive and it doesn’t matter which one you use. 

If they are not connected, then one must be negative.  Check to see which one has continuity to the body of the solenoid, which would be negative.   Don’t use the negative one with the existing positive input wire. 

I could be wrong, but it makes sense to me.

[Kiwi_Roy]

I have never seen one with two spades.
I wonder if one is connected to the large + terminal as SmithSwede suggests, its sometimes used as a distribution point for +12V
Having said that I had trouble finding one http://www.thisoldtractor.com/guzzi007/schematics/1977_750_NTX_Police_Series_1.gif
Starter (36) has a red wire feeding the ignition switch.
The spade you need will measure about 1 Ohm to ground but will also measure 1/4 Ohm to the starter terminal, there is 2 coils in the solenoid
If you look closely at the spade connector you can sometimes see the two coils connected there.
Please let us know what the other one is.

[Gliderjohn]

Thanks for the responses. After a couple more attempts I concluded this is out of my league. Contacted my auto shop and asked for recommendations for a machine shop. After a short discussion of the problem they said bring it in as they deal with that sort of thing all the time, so it is with them at this time. Will see, have much confidence  in them.
GliderJohn

[SmithSwede]

John, I suspect you are just angling for bragging rights on your weirdo starter motor. 

John:  “Hey, what kind of solenoid are you running there?  Single spade?  Pffft.  I’ve got the double spade version.  Thinking about a turbo.”

[Gliderjohn]

From SmithSwede:

John, I suspect you are just angling for bragging rights on your weirdo starter motor. 

John:  “Hey, what kind of solenoid are you running there?  Single spade?  Pffft.  I’ve got the double spade version.  Thinking about a turbo.”

Like.
GliderJohn

[g5guzzi]

I think the second terminal is used on cars that have
a ballast resistor in the supply to the ignition coil.
the wire from this terminal bypasses the resister
and supplies higher voltage for starting.
My spare starter also has a solenoid with two terminals and
that was what an auto electrician said it was for.

Malc