I'm Melting! I'm Melting!

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NickTheTrick

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Story Time:


So I was driving home late about a month and a half a go, and my headlights flickered and cut out completely. Murphy's Law indeed. I was 45 minutes from home on an empty highway. It seemed the only way I could get some light was to manually pull the headlight switch toward myself activating the high-beams. So that is what I did; you can imagine how fun it was driving once I got to the city, manually blinding everyone with my high beams and trying to shift gears without letting the switch go.
I pulled my dash apart and found that my headlight switch was burnt up and melted along the bottom (the hot, and headlight wire terminals); also the headlight and hot wire terminals in the headlight plug connecting to the multi-function switch was also melted on one side. This resulted in the destruction of my recently replaced multi-funtin switch. So temporarily, I cut the multi-function headlight plug and put a male terminal on the low-beam wire and a female on the hot wire for light, went to the junkyard for good plugs and terminals, and ordered a switch. I figured I had a bad connection on one of the terminals or something.
A few days later I spliced in a good used headlight switch plug and multi-function plug along with the terminal ends that were fried. It did fine but I smelled burning plastic, so a few days later I pulled pulled the plugs back out and the headlight switch plug was melted again. So i figured I left the corrosion one the Switch terminal itself. I then filed the terminals with terminal files until they were clean. I spliced in a second set of good terminals to be safe AND put dielectric grease in the hot holes.
I left it all loose in case it happened a THIRD time and for about a week, it was fine. I sniffed the vent right on top of the switch every time I used it or even got out the car. So it was fine for about a week and a half; I put it back together.
I was driving home tonight after doing some CHRISTMAS (screw Xmas) shopping and I definitely smelled that plug burning up. I sniffed the vent and it is definitely getting too hot.

Is there anything that anyone can add? I am not sure where to go from here. I made sure the connections were solid and clean and coated everything with dielectric grease. I hate pulling the dash and stuff apart over and over because of its age, so I'm stumped.
I'm sick of that burning smell giving me a headache!
 

bodyman

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I would suggest adding some relays to run the headlights. This will eliminate much of the load on the headlamp switch and the multifunction switch, and get more voltage to the bulbs for brighter lights. Google headlamp relay mod and you should be able to find some wiring diagrams.

I have not done this on my SHO, but have done it on my 85 T bird as I got tired of my headlamps leaving me in the dark do to burnt wiring connections at the multifunction switch.
 

NickTheTrick

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I looked it up and it seem pretty straight forward; however I am picky.
If possible I would like to avoid any modifications if possible. I just was to fix it.
How come I am all of a sudden having a problem?
 

NickTheTrick

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I would suggest adding some relays to run the headlights. This will eliminate much of the load on the headlamp switch and the multifunction switch, and get more voltage to the bulbs for brighter lights. Google headlamp relay mod and you should be able to find some wiring diagrams.

I have not done this on my SHO, but have done it on my 85 T bird as I got tired of my headlamps leaving me in the dark do to burnt wiring connections at the multifunction switch.


The more I think, the more I like this idea. I'm going to do this. I have been through two multi-function switches, two headlamp switch plugs, and a plug at the multi-funtion switch. A stupid person does the same thing over again expecting a different result.

Should I go ahead and get a new headlight switch along with another plug?
 

NickTheTrick

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Thanks for the link.

And I've actually been thinking about getting a Gen II.

Gen II's are the reason I know what a SHO is. (long story)
 

bodyman

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NickTheTrick

The more I think, the more I like this idea. I'm going to do this. I have been through two multi-function switches, two headlamp switch plugs, and a plug at the multi-funtion switch. A stupid person does the same thing over again expecting a different result.

Should I go ahead and get a new headlight switch along with another plug?

Hard to say for sure but if it was hot it wouldn't hurt.

I get wanting to keep it original, but if done with some thought it will be hard to tell that it's not.

Just curious, how did you splice in the wires when replacing the terminals?
 

NickTheTrick

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Hard to say for sure but if it was hot it wouldn't hurt.

I get wanting to keep it original, but if done with some thought it will be hard to tell that it's not.

Just curious, how did you splice in the wires when replacing the terminals?

I just used butt connectors. I'm thinking I'm going to solder them this time though and use shrink tape.

Any suggestions?
 

bodyman

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I just used butt connectors. I'm thinking I'm going to solder them this time though and use shrink tape.

Any suggestions?

Yeah, solder with rosin core solder and then heat shrink. Then take those butt connectors and toss them as far as you can. They very likely caused the second failure. I would still recommend the relays, but with better connections you may get away with fixing it like you want.

99% of time I solder my connections, every once in a while I will use the connectors that solder and shrink with the heat gun. Even when I use a ring terminal with a crimp I put a drop of solder on the connection at the end of the crimp.
 

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