Got code p1633 I changed the battery, but my lights to my radio and clock are very dull at times, sometimes there fine, what could it be?

Fords have a problem if the battery runs flat or they are disconnected thus removing power from the onboard computer(s).

You may need to take the vehicle to a dealer service center to rectify the electronics problem for you and reset your computer.. To avoid this problem you need to connect up a second power source to the main leads to the battery while you are disconnecting those leads and replacing the battery so as to retain power to the onboard systems at all times.

In any event here is an item that may help you...........


Disconnect or Replace Battery on Ford Motor Cars and Trucks


Disconnect or Replace Battery on Ford Motor Cars and Trucks



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P1633 means the battery was disconnected or became discharged enough to be unable to keep the battery-backed memory in the control module alive.

If the alternator is failing intermittently, it may not always keep the battery charged enough to properly run the engine, which could cause misfires. Ensure the battery and its terminal connections are in good shape.

I am trying to connect the two facts you listed. Your facts may not be enough to find the actual cause of the misfire, however. Certainly a disconnected or otherwise discharged battery will cause the P1633 code.

You use Google to find your codes

P1633 -- KAM Voltage too low

Maybe a bad battery

The code indicates the battery at some point dropped below 9 volts, take your car to your local auto parts store and have them clear the code, check the battery and alternator. Most places they do this free of charge.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/jason_77a19afa8d604dee

Ford code P1633: Keep alve memory voltage low.
It means the voltage going to the computer fell below about 10.5 volts to set the code.
Have you experienced battery problems recently? Or had the battery disconnected?
Things to check for: bad battery, low alternator output, battery cables, and power and ground circuits to computer,
Hope you find it, good luck.

The P0511 code is for the idle air control circuit and the P1633 is stating the the KAM voltage is too low. My guess is if you are having issues with the Idle air control circuit this could cause stalling, especially if the valve is not functioning properly and allowing too much air at idle, this causing the car to stall. I can't imagine that by pulling the connector on the A/C compressor you would get either of these codes. Have you checked for corrosion on the battery or proper battery voltage level? Here is a forum that may be of some help for trouble areas to look for (regarding P1633): http://www.taurusclub.com/forum/82-maintenance-repair/132098-trouble-code-p1633-kam-too-low.html
As far as P0511 goes if you notice any hooting type noise that is a sure indicator of a faulty IAC valve, if not then I would say first check that you do have proper output from your battery/alternator and then either take it to get properly diagnosed or try to check the circuit yourself.

When the Taurus PCM (Powertrain Control Module)(aka "the car's computer"), sees 9V DC (or less),
it sets the code P1633, so it means your battery's voltage was low recently. But since the computer
retains the code until it is reset, the battery voltage may be OK now. This is typical for cars
that have sat for awhile, and the tiny current drain of the clock slowly drains the battery until
the voltage drops below 9 Volts. Normal car Battery voltage is 12 Volts.
Fix: check the battery (with a DMM (digital multimeter)), and reset the code (with a code reader).
Workaround: have Advance/Autozone/PepBoys check the battery (free) and ignore the code.

http://www.ford-trucks.com/forums/539116-obd-code-p1633.html

P1633 Keep Alive Power Voltage Too Low (Ford/Lincoln/Mercury) It means that at sometime in the past the battery voltage was below specs at the PCM and set the code.The battery provides 12 volts to power everything,the car probably sat for a while and probably took a long time to start or had to be jumped off to start.... when the voltage got below 9 volts it set the code. The code is more of a indicator for info than anything.. the computer learns as you drive and all the code is saying is that it lost it's power to itself and can loose that learned information. Have a shop inspect the battery for being weak or dying as well as your battery connections.. if all is fine, I wouldn't worry. You can have the error reset by a mechanic or auto parts store. If you are paitent enough, the computer will reset itself over time.

p1633 is keep alive power voltage to low!! check voltage from alternator to battery, as well as all wires also.make sure battery terminals are not corroded. when car is running, voltage to battery should be 13.5 to14.5, when off voltage at battery should be 12.0 to 12.6,