1978 - 95 Amp Alternator Upgrade

[topdownstl1978]

Still can't figure out how to get the pics to show?

[DieselSpider]

Ok, I have uploaded some pictures to Photobucket @

http://s1377.photobucket.com/user/psr1978fiat/library/


Let me know if this work please and thanks.

Now to display them you click on Img while your in the edit post window and paste the link in the middle of the image block that appears which you will clearly see if you reply with quotes to this post.

[topdownstl1978]

Ok, I have uploaded some pictures to Photobucket @

http://s1377.photobucket.com/user/psr1978fiat/library/


Let me know if this work please and thanks.

Now to display them you click on Img while your in the edit post window and paste the link in the middle of the image block that appears which you will clearly see if you reply with quotes to this post.

[topdownstl1978]

This is the old alternator. The 2-piece pulley broke into pieces.

[topdownstl1978]

Thanks for helping me get pictures loaded.

Now anyone have any help for wiring the old alternator to the new?

[spider2081]

Thanks for the photos. The old alternator looks like a Bosch 55 or 65 am alternator. the + terminal is for the radio filter capacitor. The D+ terminal is the battery warning light wire ( black/violet) The Bosch alternator needs voltage from the warning light to excite the alternator otherwise it will not work.
I do not recognize the new replacement alternator so hopefully someone else can help. I'm guessing the 2 black wires you took of the Bosch alternators output stud both go to the stud on the new one located at about 11 o'clock in the photo. What the push on spade connection in the photo of the new alternator is and how to connect it I can't help you with. If it has a data plate you might try googling that info or post it here and I will try and help.

[DieselSpider]

The nut holding the pulley on appears to be backed off in this picture since there is no portion of the threaded alternator shaft sticking out past the end of it. Did you remove the nut and inspect the pulley for damage ensuring that the two washers were as they should be before cleaning it up, aligning the two halve so that they meshed properly and tightening it back up?

[topdownstl1978]

You cannot see it from the picture but the rear piece of the pulley is broken and missing a lot of metal.

[So Cal Mark]

it's pretty sad that the vendor that sold it to you can't help with a technical question

[DieselSpider]

You cannot see it from the picture but the rear piece of the pulley is broken and missing a lot of metal.

Still its a component part and a good alternator shop should be able to procure a replacement pulley for a relatively small fee.

Here is a link to a thread by ga.spider from 2013 where he did not get the spacers back in the correct order when reassembling his alternator pulley. It contains a listing with the part numbers for both the Bosch and Marelli alternator with the pulleys listed for both.

http://www.fiatspider.com/f15/viewtopic.php?f=6&t=22040

[spider2081]

Here are some photos of the Bosch Alternator parts order



Removed nut


Removed pulley halves


removed Spacers

Removed fan


Hope this helps

[lanciahf]

See if this helps

https://www.youtube.com/watch?v=6jcxxK_6byE

[topdownstl1978]

Yeah , I seen this while serving the net. I do believe I have the Bosch alternator. My issue is that I am trying to understand the wiring. What goes to the two spade terminals (+ and D+)? I have seen where the + terminal has a capacitor attChed to it. I do not have that. I have a wire with +12V when the key is on (call it red wire). And a wire that I believe goes to the alt. light (no voltage with key on, call it black/violet). My wiring diagram does not show this wiring configuration.

[spider2081]

The + spade terminal is internally connected to the alternators output post. It is for a radio filter capacitor to connect to. You don't have the capacitor and some previous owner connected a red wire which would have voltage on it all the time for some aftermarket added device. Maybe a radio memory or alarm circuit.
The D+ terminal is where the black/violet should attach. This wire comes from the battery warning light in the tachometer. The other side of the of the light receives voltage from the ignition switch "int" terminal. It has voltage on it in the "start and run" positions of the ignition switch. This excites the alternator to begin to operate once the engine starts. The light senses a ground through the alternator winding when the engine is not running to light the light. Once the engine runs the alternator output voltage is on the D+ terminal. So not the light has the same voltage on either side and goes out.

If with the ignition switch in the run position you are not measuring battery voltage on the violet/black wire the light in the Tachometer may be bad. The headlights also share the same terminal on the ignition switch so if the headlights work and your have no voltage on the black/violet wire the odds are very good you have a burnt out bulb.

[topdownstl1978]

Ok, I hate to admit it, but I was chasing down the wrong wires. I got so frustrated I started lokking at all of the loose unused wires around the the alternator location. There are several . I found one female connector that runs along with the battery circuit toward to alternator. I connected this wire to the D+ terminal and voila, all is good. Car starts, runs, charges, alt. light comes on with key on, etc. Lesson learned, pay attention to the wires that you disconnect. Now I've gotta run down all of these others.... Thanks for help