Replaced brake light switch and both brake light assemblies; still no brake lights! Manipulated connections, i.e. bent them and had brake lights for a month...now no brakelights, no taillights and the parking aid is going haywire and beeping when I am driving down the road verus backing up! Help! Also keep getting TCS error.

SOURCE: Taillights wont burn

I have 93Dynasty the car will star with a boost but than nothing , It has been cold the last days is this the cause for it.

SOURCE: no brakelights or taillights.

How did you connect the test light. Clip to frame or clip to one terminal and pointer to other terminal. If you hooked the clip to frame and the pointer to a terminal and it lit, it means that you have power there but not necessarily ground, because your test light provided the ground. What I would do is first of all not use a test light but use a multimeter instead, you can get relatively cheap one (10-30 dollars). The problem is that a test light only indicates that voltage is available not how much voltage is available, a couple of volts will light the bulb in the test light (you want to see battery volts). It's hard to tell the difference between a half lit bulb or a full lit bulb depending on the light from the sun/garage. Use a multimeter and check the clips on both sides of the car. Also check all fuses whether they indicate lights or not. If you put one lead of the multimeter to frame and the other to a terminal and have battery volts the positive side of the circuit is good. Put the other multimeter lead on the other terminal if you don't have battery volts, you have an open ground. When checking volts make sure the brake pedal is depressed. Good luck

SOURCE: no brake lights when i push the pedal

Its the signal light switch on the lever.
THe signal switch has all connections relating to the brake lights!
solution play around with the lever and see or get someone to see the brake lights work with the brake pedal down.
My car does the same thing! when i move the lever towards activaiting the high beams the brake lights work.
just gently push on the lever to see the lights go on.
you have to replace the switch and requires removing the steering wheel without setting off the airbag.

SOURCE: 1999 Oldsmobile silhouette brake light and tcs

check the abs sensors common to hit or damage the wiring or knock connection loose when doing a brake job the traction control system[tcs] is tied into the abs system

SOURCE: 2001 Olds Silhouette brake light

I'd look first at the wiring for the tow harness, since it is not really designed as a permanent system-you might just try disconnecting it to see if the problem goes away, as for the brake switch, they are usually grounds so I cannot see that being the problem at all-you have a intermittent short that is in a harness, and the most logical candidate is the tow harness.