![]() If you don’t get battery voltage, wiggle the cables or backtrack until you find the open. Reconnect the battery and check for battery voltage at terminal 55 on the connector. However, if the fuse doesn’t blow after replacing, disconnect the battery negative and then remove the connector to the PCM. If it’s still good, the problem may be a short in the compressor clutch coil. Reinstall the A/C clutch relay and check the fuse again. If it’s good, disconnect the connector to the compressor clutch. Yank the relay and see if the fuse blows now. If it’s blown, you’ve got a short between the battery junction box, A/C clutch relay, or the compressor clutch coil. If the code resets, check the fuse again. Then clear the Ford code P1633 and restart. ![]() Well, dude, chances are you’ve got a blown fuse caused by the old compressor clutch coil. You fix the compressor clutch, start the vehicle, feel the cold and then get a Ford code P1633. When a compressor clutch burns out, it can draw excessive current, or it can just plain short out. Unfortunately, that same fuse powers the A/C compressor clutch relay. Well, Ford, in it’s wisdom, powers the PCM with a 10A fuse #122.
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