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Originally Posted by Saint
You said that the antenna works fine in another car. If your dash switch is in the MAX up position, and your antenna still does not rise all the way, then most likely your dash switch is at fault.
Do this....disconnect the plug from the top of the antenna. Make sure dash switch is in MAX up position. Put the ignition on to turn on the radio...make sure the radio is now on. Now, check pin 1, 5, and 4 for power. You can use a meter or probe. I use one of those cheap probes with the built in light and nice alligator clip for the ground. Mine lit up nice and bright.
If any of these do not light up, you have narrowed down your problem.
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Do a search over on Car Audio. Lots of in depth discussion on this. Saint's advice is good. I'd also be suspicious of the circuit board inside the donor unit's compatability with the wiring in your '88. If you can, verify that the junker's set-up, including the dash switch, is identical.
IMO, that dash switch is useless for 99% of the radio reception scenarios that anyone in north america would encounter. Any which way you can to modify the wiring to get the Hirschmann to go all up and all down with the radio is the way to go.