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I assume u have a 4-pin relay
wiring is as follows:
30 - Device (Horn,Lights,etc) Pump in this case
87 - Power Source (12v)
86 - Signal From Switch (ur case-power anteanna)
85 - GND.
I dont think wiring the 86 pin to the power antenna will get what u want (on when key is on) the antenna will only go up when the radio is turned on. You need to find a switched power line that comes on when the key is turned. I know where a switched power line is under the steering wheel. Its the red/black wire on the 14-pin connector. I cant think of anything in the trunk that comes on with the key....
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