Perplexed:Hazard switch and turn signal flasher

[70spider]

Ok, here is the run down. I had no turn signals or hazards, I got a new turn signal flasher and a NOS hazard switch. Now here is the current problem, no hazards but I have turn signals (although weak and slow).
I read the wiring diagram and here is what I got:
Flasher: 3 wires; P = Azzuro (blue)
L = Viola (violet)
The Grigo (grey) wire on the diagram = + , but on the new flasher there is a X
Also in the diagram it shows a bianco-nero running to the flasher with a ground runnig off it.

Hazard Switch; 4 wires; H = Rossa (pink) although mine looks red
V = Bianco (white)
I = Giallo-Nero (yellow-black)
The Grigo wire on the diagram does not indicate a letter, however it is on the catty-corner post
opposite the Rossa
Ok here is how it looks:

L and D on the Hazrad switch have no wires connected to them.
So do I have the wires in the correct place?

Thanks for looking, Pesto

[vandor]

I have not looked at the diagram, but here's how the hazard switch works: when it's off the turn signal circuit is on, and the hazard flasher circuit is off. When the hazard switch is turned on it turns off the turn signal circuit and turns on the hazard circuit.
You can use an ohm meter to see which pairs of contacts do what on the switch and figure out what wire has to go where. You can also just touch 2 wires together to see if the hazards work.
The hazard flasher on these cars is a large relay looking thing behind the instrument cluster and they get stuck after not being used for a while. You can try tapping on it to see if it comes to life, but they often get stuck again.

[spider2081]

I think you have the wires correct.
At the hazard switch terminal "I" is 12 volts from fuse 9. It has power in "start and Run" position of the ignition switch. Terminal V of the hazard switch goes to fuse 1. It has power all the time. The gray wire on the Hazaard switch and flasher are the same wire and should have voltage on them when the hazards are off. With the hazard switch in the off position the signal lights are powered from fuse 9 and operate with the ignition switch on.
The hazard flashers operate whenever selected because fuse 1 is hot all the time.the pink wire on the hazard switch and the Hazard flasher are the same wire and should have voltage on them with the hazard light switch on.

[70spider]

Thnks for the input it helps, I have an ohm meter so I'll go checking.

[70spider]

Hello everyone 80% sucess. However,The new hazard kinda works. What I mean is when the right indicator is on the brake bulb in the left assembly blinks very faintly; and when I turn the left idicator on that same bulb in left assembly blinks faintly. I cleaned all the leads and the grounds with a dremel and all connections are shinny. I put the wires on the signal flasher and hazard switch according to the wireing diagram in the fiat manual. Any thoughts?
Pesto

[vandor]

That happens when you have a bad ground. I'd add another ground lead to the taillights that goes to a very solid ground, like the studs on the body for the trunk hinges.

[70spider]

Thanks, I think I am going to have to do that. What type and guage wire do I use?

I have gone over the wireing diagram again and again and it shows a ground comming off the tailinght assembly but I can not find a frame ground anywhere in the trunk area for the lights. I went on youtube and viewed the Fiat wireing Part 1 and 2, and in part 2 the ground is clearly visable however there is no ground in that area on my Spider (1970).

[aj81spider]

Not sure how your 70 is wired, but my 74 had the ground for the tail lights connected to one of the mounting studs for the tail light. This was a terrible place, and with the paint on the bracket I'm not sure how it made any connection at all. I created a harness and connected it to one of the mounting bolts on my gas tank. You could also use a self tapping screw to make a new ground point if you don't want to run a wire that far.

I used 14 AWG wire with crimp on connectors.

[spider2081]

I am not familiar with a 1970 wiring.
Could it be each light assembly makes its ground through its mounting . On my 1981 the marker plate light assemblies ground is made by the metal of the light assembly meeting the metal of the car.
If you tail light assemblies ground this way you would not have a ground wire. You would need to remove the paint or use a star washer on the mounting screws.

[70spider]

aj81spider,
Thanks for the info, could you do me a favor a post a pic of how you created the ground?

[aj81spider]

I'll do that when I get home tonight.

[aj81spider]

Here is a picture of the tail lights before I changed the grounding scheme. You can see the ground wire that goes from light to light is then connected on a ring terminal to one of the mounting studs for the light. The ring is held against the body mount point (which happens to be painted - making for a very bad ground).



I went out to the garage to take pictures and realized I had the covers on so some of the connections are covered. However I ran a ground wire between the lights (behind the metal that the latch is mounted to. This picture shows the crimp connections, and the next shows how I then tied it all into the mounting bolt on the gas tank.

I basically cut the ring terminals off and crimped on spade connectors. A couple of the spade connectors I made "Y" s and crimped two wires into the connector, as there were some miscellaneous grounds I tied in (like my power antenna and the side lights).

This has resulted in a reliable ground and solid operation of my tail lights.

[70spider]

Many thanks, the pictures help alot. Nice job of cleaning the trunk up looks great.

[RRoller123]

My 80 has those grounds on painted surfaces too. I think it came from the factory like that. Sanded a little paint away.

[70spider]

Ok I finally found my taillight grounds. I had to dodge the rain, sucks not have a garage. At any rate here are the pics of what I found. Apperently on the 1970 the grounds are well hiden, they were placed between the assembly and the mounting stud. As you can see they have a liitle corrosion, but the funny thing is where they mounted them is extremely well painted . Well I am very happy to have found them in this condition, because it may explain why I am having with the flashers.



Thanks for all the input I think this is case closed on the taillights. Finding these like they are I am going to locate all the grounds and see if they need improvement. So, are there any more grounds that are hiden like these where?
Pesto