I have a 1999 s10 that came with no radio and no antenna connector. How do I install the antenna connector?

One way or another, you have a poor connection from the radio to the antenna. Check the following and make sure all cables are clean and completely and properly inserted:
- a poor antenna cable connection to the adapter or from the adapter to the radio
- a faulty adapter
- a damaged antenna cable connector (wire in center pin)
- a damaged socket on the radio

It appears to be that the radio clock display has malfunctioned, and is due for a replacement radio, which could be an aftermarket or oem radio, maybe found at a junk yard.

Tools required for oem replacement radio, torx keys set.

Before working on the radio or other electronics, disconnect the battery cables with 8mm wrench.

Replacing the oem radio is much easier, if you obtain oem radio, compared to aftermarket radio, due to being direct fit.

The radio is same for 1995 to 1999 Pontiac Sunfire and the Chevy Cavalier, regardless of sub models, such as SE,GT, VL,VLX,Z24. etc.

Parts needed for the the aftermarket radio install :Stereo assembly, stereo wiring harness adapter, radio antenna adapter, and dash install kit.wiring diagram for the wire colors / functions, along with tools, such as torx key set, screwdrivers,wire crimper, wire stripper, double ended wiring connectors, hair dryer.

The oem stereo removal video is for the 2000 to 2005 Sunfire / Cavalier, but are the same or very similar procedures.

Link to oem stereo removal procedures.
Pontiac Sunfire Radio Repair and Removal 2000 2005


Link to aftermarket stereo install / connect procedures. ( Sunfire Video )
HOW TO INSTALL AFTERMARKET STEREO PONTIAC SUNFIRE

Link to aftermarket stereo install / connect procedures. ( General Video )
How To Install Car Stereo Single Double DIN Car Audio 101


Have a nice day.

REMOVAL

1. Disconnect and isolate the battery negative cable.
2. Remove cup holder.
3. Remove trim panel above cupholder by pulling straight out.
4. Remove center instrument panel trim panel.
5. Remove screws holding radio to instrument panel.
6. Pull radio rearward to gain access to the back of radio (RADIO). CAUTION: Pulling the antenna cable straight out of the radio without pulling on the locking antenna connector could damage the cable or radio.
   
7. Disconnect the antenna cable by pulling the locking antenna connector away from the radio (ANTENNA TO RADIO).
8. Disconnect bolt holding ground strap to the radio (if equipped).
9. Disconnect the wire connectors from the back of the radio.

No Most power antenna work the same. it takes two people to change them. watch and listen as radio is turn on then off do this several times then remove retainer nut turn radio on and assist removal of remaining mast watch where the teeth are located in motor assembly. fully extend new antenna mast lube with machine oil 3 and 1 works great then slowly feed new mast into motor assembly then turn radio off as you guide new mast down install retainer parts work antenna up and down overrun clutch will make the final adjustment.

yes the radio antenna motor is defective, replace it.

please rate service.

Automatic Electric Antenna
Removal

1. Lower electric antenna (18850) .

1. Remove rear retaining screws of RH front wheel splash shield for access to antenna lower retaining bolt.

1. Remove lower retaining bolt.

1. Remove radio antenna nut (18865) from top of motor tube and remove electric antenna through fender/splash shield access.

1. Disconnect signal cable and motor wire connector(s).

Installation

1. To install, reverse Removal procedure.

1. Tighten top radio antenna nut to 6-8 Nm (54-70 lb-in).

1. Tighten lower electric antenna retaining bolt to 5.8-7.8 Nm (51-69 lb-in).

1. Check operation of electric antenna and radio chassis .
   
   Automatic Electric Antenna
   
   
   

mast
Mast, Power NOTE: A power antenna mast which is bent or broken can be replaced without replacing the motor and tube assembly.
Removal

1. Remove radio antenna nut (18865) and radio antenna stanchion (18919) .
   
   
   
   

1. Loosen retaining nut inside tube using 14 mm (9/16 inch) socket, and slide nut part-way up mast.

1. Raise antenna to run plastic drive wire at bottom of mast out of motor. Note direction of teeth on plastic drive wire.

1. Saw off damaged portion of antenna mast. Remove burrs from mast and slide nut and contact tube off stationary tube.

Installation

1. With the teeth on the plastic drive wire facing toward motor on antenna, push end of plastic drive wire of replacement mast assembly down into tube. Push it around curve at bottom of tube until end enters drive mechanism.

1. Run motor down while pushing on plastic drive wire until about 305 mm (12 inch) of wire has been drawn into the tube. Stop motor and insert bottom of antenna mast into tube. Lower mast.

1. Slide contact tube and radio antenna nut down antenna mast. Tighten nut to 0.45 Nm (4 lb-in).
   
   
2. Raise and lower antenna several times to ensure proper operation.

look at antenna wires make sure every thing is in contact.if all is good.sound like problems in the sound amplifier.in radio.

you need a special tool to get the radio out. It has pins that spread out spring clips so the radio can pull out.

please rate as solved if this helps.

SECTION 413-00: Instrument Cluster and Panel Lighting — General Information 1999 Town Car Workshop Manual
REMOVAL AND INSTALLATION Bulb —Electric Clock
Special Tool(s) Radio Removing Tool
T87P-19061-A


Removal

1. Disconnect the battery ground cable.

1. Pull out the radio using Radio Removing Tool.

1. Remove the radio.
   1. Disconnect the electrical connectors.
   1. Disconnect the antenna cable.
   1. Remove the radio.

1. Remove the instrument cluster finish panel bolts.

1. Remove the instrument cluster finish panel bolts.

1. Pull out and position aside the instrument cluster finish panel.

1. Disconnect the electric clock electrical connector.

1. Remove the instrument cluster finish panel.
   1. Disconnect the headlight switch electrical connector.
   1. Disconnect the dimmer switch electrical connector.
   1. Remove the instrument cluster finish panel.

1. Remove the electric clock illumination bulb.

1985 Chevrolet S10 Pickup Truck Car Stereo Wiring Diagram
Car Radio Battery Constant 12v+ Wire: Orange
Car Radio Accessory Switched 12v+ Wire: Yellow
Car Radio Ground Wire: Black
Car Radio Illumination Wire: Gray
Car Stereo Dimmer Wire: Brown
Car Stereo Antenna Trigger Wire: N/A
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: 4′ x 6′
Car Audio Front Speakers Location: Dash
Left Front Speaker Positive Wire (+): Tan
Left Front Speaker Negative Wire (-): Gray
Right Front Speaker Positive Wire (+): Light Green
Right Front Speaker Negative Wire (-): Dark Green
Car Audio Rear Speakers Size: 4′ x 10′
Car Audio Rear Speakers Location: Rear Corners
Left Rear Speaker Positive Wire (+): Brown
Left Rear Speaker Negative Wire (-): Yellow
Right Rear Speaker Positive Wire (+): Dark Blue
Right Rear Speaker Negative Wire (-): Light Blue

on the base of the antenna mast is a chrome nut (14mm?) unsrew that, then turn radio on , it will eject the guide cable. then insert the new cable, turn radio off and wait like 15sec then the motor will take in the new cable then put the chrome nut back on> thats it