Im in the process of retro fitting a aerial amplifier unit from a XR3i to my bogo Mk4 Escort with old pull up style mast so i can have the car aerial built into the heated rear window.

So far iv connected the aerial from head unit to amp and the two wires coming off to the heated screen are no problems but the bit thats got me stuck is the other 2 spade type connectors at either side of the unit and where the wires lead off to..? Is one a power feed and the other a negative?

Had a look at the haynes and both seem to head towards the back of the head unit but theres no indications as to what they are or where they go?

All iv got to go on is one wire is thicker than the other


Could anyone help?

Thanks