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Delco Power Antenna WO/Door at the bottom of the gear case.


   These are the steps to install a cable and mast for a Delco Power unit that has a mechanical stop. These units were used by GM from 1990-2002, not all Delco units used a mechanical stop.  To know if you have this style, your unit will shut off on its own if the cable that moves the mast is broken or not installed, if it shuts off after about 8 seconds on its own then these are the instructions on installing a cable and mast.


1. Remove the power unit from the car.


2. Remove both the Mast and Cable from the power unit, ....


How to Remove the Mast:  A threw E below.

Turn on your Radio, and with the ignition key on, plug the power unit  back in and allow the power unit to cycle until it stops.  This is done with the power unit laying in the trunk of the car.

        B. Unplug the power lead from your power antenna relay.

Manually extend the mast tubes so that all of the mast sections protrude from the upper insulator.   Extend the top mast rod section from the lower tube sections.  Unscrew the Finial / Tip using a wrench.   Keep the solid top mast section from rotating by griping it with a pliers or vise grip.   ( see Figure 1 below )

        D.    Unscrew the upper black plastic insulator from the top of the mast storage tube housing using a 14mm 12 point socket, then pull the tube sections out of the storage tube. ( see Figure 1 below )

        E.   Now split the gears case by drilling out the rivets and remove the clips and then remove all of the remaining cable and hook.


Figure 1  Of the Top Mast Sections


3. Now without either the mast sections and no cable installed in the gear case, put cases back together and put  ALL clips in place.


4. Now take the power unit back to the car, FIRST turn your key on and the radio on, THEN plug the power unit back into the power plug and let the power unit run until it shuts off by its self.  Should shut off on its own in about 8 seconds.


5. Now after the power unit shuts off, THEN unplug it from the car. AFTER you unplug the power unit now turn the key and radio OFF.


6. Now GENTLY split the case and don't move a thing and only install the new cable and fish hook and put the cases back together. DO NOT move anything when you do this including the drum.  At this point the cable should be sticking out the top of the storage tube.


7. Now take the power unit back to your car, make sure that the radio & key is off, You want to plug in the unit ONLY LONG ENOUGH to draw the cable in until the rod portion of the cable is about to go in. DO NOT RUN THE UNIT ANY LONGER OR YOU WILL DESTROY THE UNIT.  You will run it only for about 2 to 3 seconds.


8. Now install the Tube sections of the mast into the storage tube along with the upper black plastic insulator that hold the Mast in, screw the tip on.


9. Now take the power unit back to the car and plug it back in, it should run down the rest of the way, if so turn the radio back on and it should run all the way up. If it runs correctly install the power unit back into the car. If it doesn't work correctly, start over with step 2



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