Alternator/generator/regulator Problems of Cadillac SRX

I had purchased the vehicle on or about July 2018 with the mileage being 91053. I did not drive at night until about November 2018. I could not see where I was going because the driver side light was so dim. I bought and replaced both front low beam bulbs to no change in sight. Finally I received a letter from Cadillac on April 05, 2019 about replacing the whole unit so I did. This was on April 10 2019. Everything was working fine. On 09\18\19 I had to get the oil changed. I went to jiffy lube to have it done. The vehicle was working fine, since I only drove maybe once or twice a week. The last day I drove it was 03\08\20. I went out to run to the store the next day and boom the vehicle would not start. There was no juice in the battery at all. I bought a new battery and had it installed ($200). After just a couple of days I had to get another jump to start it. On 03\12\20 I took it up to firestone and they said it was the alternator, so I had them replace it at $499. 81. This did not fix the problem. The battery was still being drained. I took the vehicle up to churchville service center (recommended by my son in law) and they replaced an accessory system relay. This also didn't fix the problem ($296. 74) I took it back to churchville and he replaced the body control module and had it reprogrammed ($725. 02) and replaced the battery for possible defected ($296. 74). So after spending $1818. 31 the vehicle is still having the battery lose power over about two days. There is a very bad defect in one of the four electrical systems and it can not be found. I now only have about 95,600 miles. So in 2 years I only drove 4,547 miles and having this much electrical problems. Yes the churchville mechanic pulled every fuse to look for any draw on the battery when he replaced the relay switch. I live in a condo so the vehicle was parked in our condo lot and the vehicle was station.

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