512TR - lost indicator and wiper functions

Don't have time to look at this now in detail, but my recollection is that, on 512TR, they did some clever wiring that disables the key services relay during starter motor cranking (and the key services relay is what supplies +12V when the key is "on" to enable things like the turn signal and wiper operation). The minus terminal of the key service relay coil is connected to terminal 50 (the white wire) of the starter solenoid (rather than directly to ground) -- this gives the behavior that when the key is "on" (Pos II) the key services relay is activated because terminal 50 looks like ground (the starter solenoid has a very low resistance); however, when the key is in POS III to crank the starter motor, this puts +12V on both sides of the key services relay coil and deactivates it. I'll have a peek at the 512TR schematics in a few hours so if you can describe the modification you made in more detail I'll see if it did mess up the key services relay operation and how/if it might be restored.

 

My memory did not fail me You will need to ensure that either the terminal in the F connector with the white wire (that normally goes to the starter solenoid terminal 50 and is what you probably used to control the added relay) or the terminal in the I connector with the white wire (that comes from the ignition switch Pos III) is directly, and always, connected to the starter solenoid terminal 50 in order to have proper operation the key services relay S.

 

Yes, we went over this circuit in a 512TR starter thread. OP should search for these threads because it can go terribly wrong.

As an update, I had my ND starter overhauled this past winter and now spins much faster and starts immediately. There are a couple of things that go wrong with these starters internally and mine had both, find a good shop to help.

 

Here's the earlier thread that Andrew (dgt) mentioned:

https://www.ferrarichat.com/forum/threads/starting.567708/#post-145779793

Just for full disclosure, I'm still opposed to adding the auxiliary relay (because of the difficulty of doing this in a robust way, and what can happen if the relay fails), and think you would be better served by ensuring the starter solenoid is fresh and adding a heavy jumper wire to directly connect the white wire in the I connector to the white wire in the F connector while not removing those wires from their connectors (which removes the flaky connectors and PCB from carrying the large solenoid current, but keeps their connections in place to keep relay S working correctly). JMO.

 

I agree with Steve on the relay.

Apart the connectors in the start circuit wiring, the ignition switch internal contacts burn out over time. You can measure the voltage drop to the white wire at the fuse board when starting.
Also, adding a flyback diode to ground dumps the energy from the solenoid when the start switch is released which prolongs the contact life.
I had to replace my ignition switch, it was unreliable and added a diode too.

 

Sometimes replacing the solenoid works. Check the cross reference to get a cheaper replacement