67 Mustang head light switch problems

[Mustangsavage67]

Hi all,

So i recently bought a new tach and water temp gauge, both by auto meter. The only difference between these gauges and my old ones is that my water temp gauge has a built in light and not the bulb type light it had before. Well after wiring these up together and connecting them to my light switch they fried the circular spring that is used for dimming. The spring got to hot and broke basically. So i got a new headlight switch. What im wondering is why is it destroying the switch like this. Everything is grounded right. Am i missing something here? The only solution ive thought of as of now is wiring the lights for the tach and water temp gauge to a switch separate from the normal light switch. Any ideas Thanks

 

[Realmongo]

Sounds like it's time to grab a multimeter and look for a possible short. Something is drawing way too much current.

 

[rbohm]

mongo is right, something is drawing too much current, and even aftermarket bulbs wont do that, unless you have added something like 20 more to the circuit.