Gauge Lights

kenny21 · Apr 18, 2007

Hi
I am having a problem with my gauge lights not working. I've replaced intrument voltage regulator and checked the ground and all the bulbs and still not getting any power. The weird thing is though is that the other night i was driving home and had my hi beams on and i hit a bump in the road and they came on then i hit another bump and they turned back off. Is there something i'm missing?Appreciate any advice.

Rusty67 · Apr 19, 2007

I would have said check your fuses but it sounds like thats not the problem since you said they randomly worked. It could be a defective headlight switch.

chromedog · Apr 19, 2007

it sound like the rheostat in the headlight switch to me...theres a fine wire, coiled around the inside of the housing that is used for the dimmer, it may have broken.

dennis112 · Apr 19, 2007

chromedog said:
it sound like the rheostat in the headlight switch to me...theres a fine wire, coiled around the inside of the housing that is used for the dimmer, it may have broken.

+1 Try replacing the headlight switch--that is the normal source of this type of behavior.

kenny21 · Apr 19, 2007

So i just now got done installing the new light switch and still no gauge lights. I did notice however that my fuse box is looking pretty beat up. Do you think it could be that or is it a ground? If anyone has some ideas i'm open to suggestions.

Rusty67 · Apr 20, 2007

Are your fuses all good ? Double check them. You may have blown a fuse out if you didn't pull the battery cable when you went to change the switch out.

geostang351 · Apr 20, 2007

Rusty67 said:
Are your fuses all good ? Double check them. You may have blown a fuse out if you didn't pull the battery cable when you went to change the switch out.

I'm having the same problem. You are saying that from the fuse box a wire goes to the light switch then to the light cluster? What fuse would be out? What color is the wire from the fuse box to the light switch?

Rusty67 · Apr 20, 2007

geostang351 said:
I'm having the same problem. You are saying that from the fuse box a wire goes to the light switch then to the light cluster? What fuse would be out? What color is the wire from the fuse box to the light switch?

I don't know if its the same for every year Mustang. I've got a shop manual for the 67 so if you have a 67 I can look that up. What year is your car ?

chromedog · Apr 20, 2007

blue with red tracer...my diagram shows it is switched before the fuse box... all wires from switch onward are blue/red.

kenny21 · Apr 20, 2007

I have a 68 convvertible. And the only reason i think it may be the actual fuse box is because when I turn my heater on you can see it spark and the heater turns on and off whenever it feels like it. My only dilema is where can I find a replacement or should i just update it to the newer verision box and fuses. Any suggestions?

geostang351 · Apr 20, 2007

chromedog said:
blue with red tracer...my diagram shows it is switched before the fuse box... all wires from switch onward are blue/red.

I know its blue/red from the swith to the lights but what about from the fuse box to the switch?

I have a 68 also

geostang351 · Apr 20, 2007

GOT IT!! Blown fuse that couldn't be seen by the eye. Used Ohm meter. It was the short fuse in the middle of the fuse block.

kenny21 · Apr 26, 2007

Well I was right. I replaced the fuse box and everything started working great.
Thanks for all the help and suggestions.

geostang351 · Apr 26, 2007

Good for you!

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