Install new fixed antenna mast cable on a 78 corvette

Its most likely running because of a broken mast cable.
The ACC fuse powers the antenna. But it also powers the interior lights, door locks, etc..
May just want to go under the dash and find the connector and unplug it.
If you go for an aftermarket replacement mast, not all work.
The cable on that is most likely a smooth cabel with a J hook at the end. Most the aftermarkets have teeth and no hook.
Napa auto parts sells replacements that may work. When the antenna mast did the very same thing on my 89 Camaro I got a replacement from Corvette Central. Pricey for just a top section of the mast but just about all I could find.
Aftermarket antennas are fairly cheap and can work.

Hope this helps you ??

They make a mast kit for this, it requires the antenna be pulled out of the car to replace the broken mast.

How do I install a new antenna on my GMC 05 2500 Sierra. I have to replace the base because it broke off. I've taken the dash off. But cannot seem to fish wire through the firewall.

Sounds like you need "91 Corvette power antenna mast and cable" I replaced mine 4 years ago for 34.00 on Ebay. you might do a search on CORVETTE Power Antenna MAST 1988-1992 + How 2

They have it for $21.99 + $5.00 shipping. Or just search on ANTENNA MAST, there are 2,700 matches for this search.

necss03

Toyota Pick-ups/Land Cruiser/4Runner 1989-1996
Antenna - REMOVAL & INSTALLATION

If your antenna mast is the type where you can unscrew the mast from the fender, simply do so with a pair of pliers. Most damaged antennas are simply the result of a truck wash or similar mishap, in which the mast is bent.

Manual Antenna

1. Disconnect the antenna cable at the radio by pulling it straight out of the set. Depending on access, this may require loosening the radio and pulling it out of the dash.
2. Working under the instrument panel, disengage the cable from its retainers.
   

On some models, it may be necessary to remove the instrument panel pad to get at the cable.

1. Outside, unsnap the cap from the antenna base.
2. Remove the screw(s) and lift off the antenna, pulling the cable with it, carefully.

To install:

1. When reinstalling, make certain the antenna mount area is clean and free of rust and dirt. The antenna must make a proper ground contact through its base to work properly.
2. Install the screws and route the cable into the cab. Make certain the cable is retained in the clips, etc.
3. Connect the cable to the radio; reinstall the radio if it was removed.

Power Antenna Mast
The power antenna system contains a relay. If the power antenna is inoperative, the relay is the first place to look. The actual motor rarely fails.
The power antenna mast is replaceable on the Pick-Up and 4Runners. If the mast is damaged or broken, proceed as follows:

1. Perform this repair with the battery cables connected. Turn the ignition switch to the LOCK position.
2. Remove the antenna nut.
3. If equipped with a CD player, press the AM and FM buttons on the receiver and simultaneously turn the ignition switch to ACC .
4. For non-CD player units, press the AM button and simultaneously turn the ignition switch to ACC .
5. The antenna motor will run, unwinding the mast from the spool. have an assistant guide the mast so it doesn't fall and damage the bodywork. When fully extended, the mast will be released. Remove it, and leave the ignition in the ACC position.
   

To install:

1. Insert the new cable so that the teeth face the rear of the vehicle. Feed the cable into the motor until the cable reaches the bottom, about 12 in. (30cm).
2. Have an assistant ready and prepared to guide the cable. Turn the ignition switch to LOCK . The motor will run, winding the cable onto the spool and drawing the antenna down into the mount.
3. If the cable does not wind, twist the cable at the top of the housing; the part at the bottom may have turned while being pushed down the hole.
4. Once wound onto the spool, install the antenna nut even if the antenna is not fully retracted. Test the antenna elevation and retraction; the mast will eventually retract fully.

Hope helped with this (remember rated this post).

Remove old Antenna

1. Activate the antenna switch to the up position.
2. Using the wrench or needle-nose pliers, loosen and remove the original retaining nut on the base of the antenna mast.
   
3. Gain access to the underside of the area of the trunk where the antenna is located.
   
4. Remove the bracket or brace that is below the hole and holding the antenna in place.
   
5. Remove the mast.
   
6. Find the motor that controls the antenna mast. Generally, power antennas will have a constant 12-volt lead and a ground lead. The ground lead will be grounded to the panel next to the motor.
   
7. Remove the ground lead from the panel.
   
8. Pull out the antenna coaxial cable.
   
9. Unplug the coaxial from the extension coaxial cable.
   
10. Remove the original antenna coaxial cable. Note the route the cable follows.
    

Install new Antenna

1. Inspect the fender area where the antenna mast will be mounted for rust.
   
2. Clean the area before installing the new antenna.
   
3. Plug the new antenna coaxial cable to the extension coaxial cable.
   
4. Plug the new antenna's coaxial cable into the radio's chassis antenna jack if there is no extension coaxial cable. Tie or tape the string you put on the extension cable to the new antenna coaxial cable. This assures that the 2 cables stay together as you route them to the antenna mount in the fender.
   
5. Connect the power lead of the antenna to the power antenna lead on the radio.
   
6. Connect the 12-volt constant lead to the antenna to a 12-volt source or to the ignition switch.
   
7. Direct the new antenna cable via the same route followed by the original antenna cable on up to the hole in the fender in which the mast will be mounted.
   
8. Ground the ground lead from the motor to a clean metal surface on the metal panel near the mount.
   
9. Insert the mast into the hole. Face the serrated side of the plastic cable on the bottom of the mast toward the motor side. The plastic cable can be inserted freely to about 12 inches and will stop.
   
10. Turn on antenna switch to down position until the plastic cable goes down and catches into the gear mechanism of the drum housing. If the plastic cable does not gear into the mechanism, twist the cable slightly until the cable contacts into the gear mechanism while the motor is in operation.
    
11. Stop the motor after the cable goes into the housing 12 to 25 inches.
    
12. Secure the bracket or strap to the bottom of the antenna mast and to the metal fender.
    
13. Replace the retainer nut to the base of the antenna mast and secure tightly.
    
14. Replace the panel that covers the antenna mount area.
    

Have the antenna motor tested re place it if not working if antenna motor is working you will need a new antenna mast and antenna cable to remove this unscrew the washer nut at the base of the antenna and turn radio on antenna should push up and play out he cable to replace insert new cable and turn radio off it will draw cable in and antenna tighten washer nut and your dne

Give these instructions a shot. Might be too generic but might be enough to get you going. Removing Original Antenna
1. Step 1 Activate the antenna switch to the up position.
   
2. Step 2 Using the wrench or needle-nose pliers, loosen and remove the original retaining nut on the base of the antenna mast.
   
3. Step 3 Gain access to the underside of the area where the antenna is located.
   
4. Step 4 Remove the bracket or brace that is below the hole and holding the antenna in place.
   
5. Step 5 Remove the mast.
   
6. Step 6 Find the motor that controls the antenna mast. Generally, power antennas will have a constant 12-volt lead and a ground lead. The ground lead will be grounded to the panel next to the motor.
   
7. Step 7 Remove the ground lead from the panel.
   
8. Step 8 Pull out the antenna coaxial cable.
   
9. Step 9 Unplug the coaxial from the extension coaxial cable.
   
10. Step 10 Remove the original antenna coaxial cable. Note the route the cable follows.
    Installing the New Power Antenna
11. Step 1 Inspect the fender area where the antenna mast will be mounted for rust.
    
12. Step 2 Clean the area before installing the new antenna.
    
13. Step 3 Plug the new antenna coaxial cable to the extension coaxial cable. (On some General Motors and Ford cars you may need an adapter to mate the 2 cables together. Car audio retail stores sell such an adapter.)
    
14. Step 4 Plug the new antenna's coaxial cable into the radio's chassis antenna jack if there is no extension coaxial cable. Tie or tape the string you put on the extension cable to the new antenna coaxial cable. This assures that the 2 cables stay together as you route them to the antenna mount in the fender.
    
15. Step 5 Connect the power lead of the antenna to the power antenna lead on the radio.
    
16. Step 6 Connect the 12-volt constant lead to the antenna to a 12-volt source or to the ignition switch.
    
17. Step 7 Direct the new antenna cable via the same route followed by the original antenna cable on up to the hole in the fender in which the mast will be mounted.
    
18. Step 8 Ground the ground lead from the motor to a clean metal surface on the metal panel near the mount.
    
19. Step 9 Insert the mast into the hole. Face the serrated side of the plastic cable on the bottom of the mast toward the motor side. The plastic cable can be inserted freely to about 12 inches and will stop.
    
20. Step 10 Turn on antenna switch to down position until the plastic cable goes down and catches into the gear mechanism of the drum housing. If the plastic cable does not gear into the mechanism, twist the cable slightly until the cable contacts into the gear mechanism while the motor is in operation.
    
21. Step 11 Stop the motor after the cable goes into the housing 12 to 25 inches.
    
22. Step 12 Secure the bracket or strap to the bottom of the antenna mast and to the metal fender.
    
23. Step 13 Replace the retainer nut to the base of the antenna mast and secure tightly.
    
24. Step 14 Replace the panel that covers the antenna mount area.
    

antenna mast is no good.. you can buy a mast and have it installed or buy a used antenna and have it installed im sure Elite foreign auto parts has only saab parts.. tested and used,