200 Cougar blowing headlight fuses

Check the wires behind the fuse box and where those wire go through any metal bulkheads or framework. You do indeed have a dead short. Look for insulation rubbed through. Also work from the lights backwards to the fuse box.

https://www.google.com/search?q=2007+Chevy+Tahoe+TIPM

..

Perhaps this can give you some ideas and steer you in the right direction. Do a Google search:
2004 Saturn VUE park light diagram
I came up with schematic diagrams which may help you trace out the circuits. I hope this helps.

short some where in wires or mabe water in connector

headlight switch is bad, change the headlight switch itsellf will short out, therefore blowing your fuse. turn signals and break lights are on a different relay, therefore they will still work

you have a short circuit somewhere that is causing the fuse to blow,it is most likely the headlights unless you have been messing with the dashlights,you will need to check all the headlight wiring to see if you can find the fault.......hope this helps......cheers

I suspect wear and tear has shorted a wire somewhere. The question is where is the problem?
A little deductive work can go a long ways.
If the running lights work fine but it blows when the headlights come on then it is in the wires going to the headlights.
Try this. Get someone to help you by watching the headlights when you turn them on with a next size larger fuse. See if your helper notices one of the headlights being dimmer then another. If he does then it is "Likely" that that particular headlight circuit is the culprit.
Start tracing the wiring back from that headlight till you find the problem.
Note: You may have a bad headlight switch as well. as in it could be shorting out inside when you flip the beams on. If neither light comes on at all or merely flicker then Id be very suspicious of the switch.
If you are the only owner of this vehicle then you know that nobody has been hacking the wiring. But if you bought it you never know if there might have been a splice poorly made by somebody else that is now shorting out.
Hope you find it fast. wiring problems are a real headache.

it sounds like a short in the park lights.you will have to start by disconnecting headlight switch then install fuse,then check all park light bulbs and there sockets, its gonna be a bad switch or socket, enless theres a wire touching ground ,but start with the switch and checking all sockets. hope this helps.

there is short somewhere. fuses don't blow if there is no short or overload. check the switches.

If the fuse blows there is a short to ground . Do you know what a dead short to ground is.? Which fuse blows ? # fuse ,#1 15amp ?
How to find an open circuit or shorted wire the FAST easy way

How to test for short to ground ohmmeter vs test light
Electric Testing Techniques You Need to Know
Basic Electricity for Service Techs Ohm law Current Flow Opens Shorts

I had similar problems, with dash board lights and headlights flickering, and the problem was a dying alternator. After I changed it, everything got back in normal. Also, a bad alternator eventually will kill your car's battery, too. I hope this will help you.