96 HD1200 left turn signal switch not registering on dashboard after reassemby found small black plastic piece unsure if came out of switch. rectangular and curved appx. 1/4"w x1/2l x1/8"h with small arrow on edge and hole in center?

You talking about the multifunction switch?
Autozone.com
has this repair info. You have to register your vehicle, it's all free. After it is registered, if the upper left site search box, type in, " multifunction switch", then on the right side of page, click on the link, scroll down the page to find the info on. You can try the link? yhttp://www.autozone.com/repairinfo/repairguide/repairGuideContent.jsp?fromSearchPage=true&pageId=0900c1528025f08e&partName=Turn+Signal+Switch&partId=0900c1528025f08eour vehicle.

Check fuse numbers 23 and 33 under the dash, and number 12 under the hood. If those are okay, then check the turn signal switch on the steering column. Remove the shroud from the column and look closely at the switch assembly, making sure there are no broken pieces of plastic, or loose connections. Also, the turn signal relay/flasher unit is attached to the bottom of the switch - it's a small, black box that plugs on to the switch assembly. Check it out, and replace it if it's bad.

On 95-97 and possibly 1998, Chevy Blazers both the turn signal and hazard flashers are located behind the lower dashboard trim just to the left of the cigarette lighter. You can not get to it without taking apart the trim.-----------------------------------------------------------------------
tacho pro 2008

Check the RL switch an hazard switch

You'll have to drop the lower dashboard panel to access the switch. There are two clips on the bottom/back behind the pedals. One is white and behind the brake pedal, the other attaches to the left foot plastic floor mount. The white clip can be rotated to come off of the dash panel. The left foot floor mount can be removed with the recessed nut near the top and then separated from the dash panel. There are 5 screws affixing the dash panel to the framework. Two are obvious, on the bottom corners. One is accessible after removing the fusebox cover. The other two are next to the steering wheel and are accessible after popping the small shroud piece off from around the steering column. The shroud is held in place only by clips. After dropping the panel, the brake switch can be found at the top of the brake pedal arm. Disconnect the wiring clip from it and then turn the switch counterclockwise. It will pop out after about an 1/8 of a turn. Should be about a 20 minute job in total. Good Luck!

there is another tool that pushes down this plastic piece so you can remove a small ring on the steering shaft then procede from there have fun its not to bad

That plastic piece is the brake light switch.

The fuse box or panel, is located under the dash on the far left, next to the parking brake release handle. Looking in this area, you will notic a small black plastic panel. Remove this panel and you will see the fuses.

There is a second fuse panel under the hood, up against the firewall. Remove the large black plastic panel and you will find a row of relays, and a number of large type fuses.
Bill

salvage yard steering column get one for parts and see whats missing in yours or change column much easier

i thin the piece you are referring to is for the dimmer switch its a black plastic piece you will need to dissasemble it and install the piece maybe this link will help http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c1528003dd20