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Hazard switch ninja needed

Go to solution Solved by marklimon,

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Hello, I have been trying to get my turn signals working and have read old posts about the hazard switch being a likely culprit.
My car is a '73. I had turn signals that worked, but the right side was dim when the headlights were on or when signaling right. When the hazard light was on they all lit up brightly.
I started by cleaning grounds on the front turn signals and then the dim light was much brighter with the headlights on, but now neither signal works. The hazards still functioned. My hazard switch was not able to be turned off so somewhere in the vehicle's history, a PO "installed" a manual switch retainer:
This made me suspect that there was something going on with the switch, so I removed it and took it apart. I see how it is intended to work with the silver pin following the track on the button to either engage, or to disengage the switch. What is happening on mine is that the silver pin and arm will not follow the track and find its off location. It seems that it would benefit from a small weak spring to push it over. Do I have all the internal parts that it came with? I'm going to assume that there is a wise 2002 guru here that knows exactly how to solve the problem. I'm that guy that spent too much money on a car that shouldn't have cost as much as it did, so just buying a new switch for $100 is something I'd rather avoid. Thanks

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PM me--I did a column on troubleshooting a 73's hazard switch.  As you know, the current that works the turn signals passes through that switch, so if it malfunctions, it'll mess up your turn signals.  The column also mentions how to shore up that little spring so the switch doesn't turn itself on at an inopportune time...



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Thanks @Mike Self. I reached out for that column and you sent it to me a couple days ago. Being a visual person, the lack of images made it difficult to understand the part about the spring. In your column you mention a flat spring in the switch, I'm going to assume that the flat spring is a part of the silver pin (in my photo above)? Is that pin supposed to be spring loaded? And you suggest shimming that spring with a piece of plastic from something like a credit card, but I'm not sure where that would go and how it would work securely?

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OK, so now that the switch is fixed and reliably clicking on and off, I've discovered another gift left by a previous owner. The loom had a rogue wire spliced into it to power the stereo. When I gave a little tug, it just popped off. It was loosely twisted to a purple/ black wire in the loom. With the complexity of this switch, I'm wondering where that wire was meant to go? 

Currently there are 14 (!) wires going into the back of the hazard switch. This has to be some kind of automotive record.
I have:
Brown (1) - ground at hazard signal relay
Red w/ white stripe (4) - to fuse #4

Blue w/ black stripe (2) - right turn signal (1 for front, 1 rear)

Blue w/ grey stripe (1)- ?
Green w/ purple stripe (1) - hazard signal relay

Green w/ yellow stripe (2) - hazard signal relay
Blue w/ red stripe (2) - left turn signal (1 front, 1 rear)

Purple w/ black stripe (1) - ?

I'm taking the locations off the bluebook scans that I have as well as the color diagram that I see pop up on this forum from time to time. The problem is that I see some differences and I don't know where that other purple/black wire in my loom is supposed to go.
In the blue book scans there is a black and green wire that goes to fuse #5 as well as the reverse light switch. I don't have black green, but maybe this is my purple/ black? 
There is also the blue/ grey that does not show up in any of the wire diagrams that I have. I do see a loop from 49 to 0 on the hazard switch without a wire color callout. Maybe this is the grey/ blue wire?

The big question is what do I do with this mysterious purple/ black wire?

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Bumping this because I still need help. Would it be ok to just connect the mystery purple/ black wire to the other purple/ black wire in the same harness? I’m thinking that makes sense, but what do I know?

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It looks like those 2 wires are colored violet/black and are attached to the same terminal on the switch.  They are shown as 2 sizes, a 0.75mm and a 1.0 mm.


Examine the switch were the one is attached to see if there is a second stub from the same point.  Per the diagram the 2 could be connected together and circuit would be complete, but the one connected to the switch is taking on the amperage of both.

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A radiator shop is a good place to take a leak.


I have no idea what I'm doing but I know I'm really good at it.

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I test connected the purple and black wires together and everything worked as expected. So I went ahead and properly soldered and heat shrinked the wires and re-wrapped the loom with loom tape. After re-assembly I noticed one little issue, when the turn signal is switched to the left turn position the left bulb comes on. So I need to make sure it doesn’t get left in that position. I’m going to call that 97% success. Thanks for the help everyone!


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