When slowing down Batt light comes on and loss of power steering. Had alternator and batt checked and came out good. this is an intermitant problem.

You need to check the small connector that plugs into the back of the alternator. One of the pins will have a power supply when the ignition is in the on position. It could be 12v or 5v so a voltmeter should be used to detect it. If no power check fuses. Possible bad charge fuse or wiring to the alternator. If power supply is there, possible faulty alternator ( even though it's new )

alternator seems to be bad check connections if all else is good have the alternator bench tested

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Bad battery or alternator have both tested and replace the bad part also check battery cables both power and ground and power cable from alternator(since sometimes its something cheap and easy like that)

Battery might seem fine on a routine check, but the crancking amp power is not there anymore, seems that your alternator is not charging it anymore, have the alternator checked and replaced if needed, the battery might need replacing too.

You need to replace the Alternator. The vehicle died because you removed the power supply to all the accessories, if you remove the Negative cable and it dies then you know for sure it is the alternator. that is an old shade tree way to test the alternator.

it sounds like you have a draw on the batt. you can test for draw by disconnect + cable from batt. then
use a 12v test light with 1 end + batt term the other to the cable end now with all doors shut all lights
and electronics off + key in your pocket also you may have to remove the engine comp. bulb to avoid
a false read the test light should be out if not you have a draw. the next step is with the test light in
place pull 1 fuse at a time till light go's out that fuse
controls the circut giving you problems
(pull dome bulb before you pull fuses no false read)
also, check any after market devices first radios-
alarms-remote starters etc.
with that said the problem may be intermitent as you
said every 2 weeks if you get no results on1st test
next time the batt. is dead (not flat stone dead)
test it again before you jump it this would be the
best chance to catch an intermitent draw.
any other ? gimme a shout good luck

replace the alternator.the batt light and brake light are on the same circuit, and the air bag ecu is seeing low voltage, intermit alt failure

Check battery cables make sure clean ground to chassis from batt.

Im not sure how you tested the alt. but its a good idea to take a volt meter and with the car running,check at the battery and the check at the back of the alternator on the big wire its the 12v feed from the battery,you should read the same voltage at the batt. example 14.3 vor so at the batt. and only10v or so at the alt or even zero V.then we can narrow it down a little to a possible open circuit between the batt. and alt.If you need any diagrams just let me know,hope it was helpful have a good day DB

So found the problem it was the seilnoid on the wasnt working properly store said good put it back hit with small hammer fired up so just replaced whole strarter now fires first time sounds awesome had lot of trouble tracking it down went threw new battery's thinking that was prOblem but was bad starter unit try this maybe will help u to