Where can I find a wiring diagram for a 1975 Fiat 124?

[markpink]

I have wiring diagrams for many of the Fiat Models, But not for my new project a 1975 Spider.

The wiring seems to be different from other model years. IAP no longer has the 1975 wiring diagrams for purchase.

Has anyone ever seen a wiring diagram for a 1975 124? Or knows where I can get one? Other model years will not help. I need the 1975 one.

thanks


Mark

[So Cal Mark]

75 should be virtually identical to 76

[markpink]

Hi Mark,

I have the 1976 wiring diagram.

My wiring for the ignition switch doesn't match the 1976 diagram.


thanks

mark

[markpink]

Mark or anyone.

This is what I have for the ignition switch wiring... I have updated what some of the wires seem to do...

green with black stripe. This goes to the positive terminal on the coil
pink and blue with black
brown has 12 volts
black has 12 volts
blue with yellow stripe powers accessories/including radio
blue with with pink stripe supplies headlight power

Am supposed to have 12 volts on the black wire?

The previous owner never got the car started. It turns over but with no spark. I replaced the coil and the points. But I didn't get voltage at the coil. I had a problem with a ignition switch in the other car and this switch was rusted so I replaced the ignition switch. I don't believe the wires were connected properly in the old switch.

I keep playing wiring roulette and can't seem to find a combination that gets of of the following at the same time: 12 volts at the coil, power to the normal car accessories(headlights etc), and the starter to turn over when I turn the key. I have had two of those, but never all three.

I am just trying to match the wires to the correct terminals.

thanks

mark

[markpink]

I got a wiring diagram for a 1975 124.

It helped confirm that someone seriously rewired my car in the past and did a insanely poor job. I am going to either rewire the many major connections if I want to keep the car.

Thanks to everyone who responded with private emails.

Mark

[bobbycook]

Mark did you ever get 12v to the coil? That voltage is controlled by the iginition switch ( smart am i)...any way you need to get that voltage traced out...I do not know your expertise but use a volt meter and check for off on v at the IS Iignition swithch) in the on posiiton using the termianl indicated by your diagram as the proper terminal...note the color lead wire..if you have voltage,,that is your reference...you can tell you have the corrrect terminal by turning the swtch to the off position and it should not show a voltage...( circuit light speeds this up consideralby).. Try the same test on in the start oositon on the IS.. U shld still se V..Just chekcing to be sure there are not interneal opens or u are not on an acccesy circuit..

Once you have a refernec V and color lead. You need to go to the first coupling anc verify V is gettbg through to the corresponding lead..you need to do this unitl you find where the break is ( I think there are 4 couplings in the start cirucits..) Some whee hopfuly you will pick up the col lead to your coil..and also find the open

Use this plan for each of the major componets not working...Find out what is not working first and trace it out...Try to focus on only one componet a time rather than do a emasse rewire...

Beware that there are 3 banks of coils that have to be checked out also...Check for coil voltage on one side of the coils and for 12 V on one isde of the contacts..If either is missing, you will need to fine out why..The coil will be enegise when the it is grounded by the controlling switch/sensor etc...You can check the coils by removing the one in question and appling a voltate to the coil side and lisnd for a click..better still use a volt meter and check to see it the contacts are closing or open what eve the case may be..

I ma concerenc because I think the black lead is the ground circuit on these autos..and you may have a short some where.. Would be willing to bet that if you traced it, and find where v is gettin in,U will clear up a lot of problems. Y should not read a voltate on a ground lead to ground.....????

Let me know if I can help ya on this,,

[gcorsar]

OK, old post, but Mark said he found the '75 wiring diagram. Do you still have it? Can you scan it or pass it to bradartigue, he said he'd be able to trace a good scan in my related post: http://www.fiatspider.com/f08/viewtopic ... b8#p201659

Thanks!

[bradartigue]

Also note that FIATs are a bit...weird...with regards to wiring and much of the weirdness was in the mid 70's. Make sure you understand the wiring and what should be hot when the car is off or on, for example:

My friend's 1979 - a dead stock car except for the head - has an ignition switch that came from the factory wired like an early Spider - the wipers, defrost fan, and a couple of other things work when the key is off. Which, oddly enough, makes the LADA ignition switch a perfect replacement switch in his car because that's how it works.

My former 1979 - also dead stock once upon a time - had these items switched.

In other words, don't let logic get in your way. If your car differs from the wiring and it is obviously stock, it may just have been that way. It should be easy to spot owner modifications, the wires FIAT used are pretty unique in size and coating. Most owner hacks use shiny shit wire from Radio shack.

[gcorsar]

Well, to confirm Fiat wiring weirdness, I was looking at the alternator, doing some recon before installing a wiper relay upgrade, and found a wire not connected to anything at the back of the alternator! Probably not a good thing. So I began hunting all of Brads wiring diagrams to find out what the disconnected wire went to. There was no unused terminal on the back of the alternator and there's nothing electrical anywhere near it. Hmmm...

The wires in question are a yellow/red and a gray wire. All the diagrams I found showed a yellow and a gray wire, no yellow/red. So I grabbed a greasy old Haynes manual that had a bunch of wiring diagrams for various models and they too only had yellow and gray wires. Not to overlook any possibility I noticed a wiring diagram falling out of the back of the book under chapter 13, Supplement. It had a wiring diagram for "later UK models" and guess what, it shows a yellow/red wire! (Well really, a giallo-rosso wire, but we are talking Fiat.) It also shows the gray wire, the one not connected to anything, and indicates that it goes to the voltage regulator! What I think I'm going to post something in the electrical section to see what's up with that.

[bradartigue]

Well, to confirm Fiat wiring weirdness, I was looking at the alternator, doing some recon before installing a wiper relay upgrade, and found a wire not connected to anything at the back of the alternator! Probably not a good thing. So I began hunting all of Brads wiring diagrams to find out what the disconnected wire went to. There was no unused terminal on the back of the alternator and there's nothing electrical anywhere near it. Hmmm...

The wires in question are a yellow/red and a gray wire. All the diagrams I found showed a yellow and a gray wire, no yellow/red. So I grabbed a greasy old Haynes manual that had a bunch of wiring diagrams for various models and they too only had yellow and gray wires. Not to overlook any possibility I noticed a wiring diagram falling out of the back of the book under chapter 13, Supplement. It had a wiring diagram for "later UK models" and guess what, it shows a yellow/red wire! (Well really, a giallo-rosso wire, but we are talking Fiat.) It also shows the gray wire, the one not connected to anything, and indicates that it goes to the voltage regulator! What I think I'm going to post something in the electrical section to see what's up with that.

Giallo-Rosso wire goes to the 30A terminal on the relay to the flux capacitor. If you hook it up and drive 88 MPH you'll end up in whatever model year your car come from.