Cadillac: I have a question about a 1997 Seville STS

I have a 1997 Seville STS and it has a light problem, when my
headlights are on and I use the left blinker it comes on solid and
does not blink, when the headlights are off and I use the left blinker
the front left blinks normal but the entire back end of the car blinks
including license plate light, when my head lights are on everything
is coming on and staying on including the 3rd brake light that goes
all the way accross the trunk, I had a blown left park light fuse and
replaced it but I am still having the same problem, also when the head
lights are off and I hit the brakes the left front blinker comes on
solid while holding the brakes, I dont know if it is a bad relay
somewhere but I have checked all of the fuses and I dont know what
else to try any help would be greatly appreciated

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Electrical problems can be the hardest thing to find. I've had a
couple of electrical problems that weren't "normal" like a bad ground,
etc.
Once on a mid '80's GM product I kept blowing fuses on the turn
signals a couple weeks after I bought the car. I checked both ends of
the car for grounds, etc. but to no avail. So I began to remove the
door sills on the left side of the car where the wires ran to the
back. What I found was staples thru the plastic left rear door sill
in a effort to hold the carpet in place. However, the staples went
into the wiring as well causing a short across from one wire to the
next, or a bad ground and blowing the fuses. I asked myself, why
now? Why did it decide to show up after a couple of weeks? The only
thing that I could summarize is that my little girls were stepping on
the sill when entering the car and drove the staples down into the
wiring. Of course this had been a bad fix at the dealership to begin
with and the staples should not have been there in the first place.
Another time in a mini van the rear gate wiper would come on and off
by itself. Trying to find the fix for this one was driving me nuts.
By chance I replaced the battery before winter set in. I like to have
a good battery in the winter. And guess what? The problem no longer
happened.
Bad batteries can cause many strange electrical problems. Many
times the repairs on a car are usually the simple things. So might I
suggest checking the age of your battery. If it's over 3 yrs old have
a mechanic give it a good testing, and not just for draw down. If
it's much older than 3 yrs replace it with a good brand name battery
like interstate and not some walmart or other dept store off brand.
My two cents worth. f.b.