Car won't start in cold weather (below 40 degrees)

I have a 2010 Subaru Forester that will start fine during the spring-fall months when it’s 40+ degrees outside. Once the weather is about 35 degrees or colder, the car will not start.

I also see a pattern where I’m more likely to get it started (after MANY attempts) in cold, but dry climates (Colorado) whereas I have almost NO hope in cold, damp climates (Wisconsin).

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It is turning over, but will not start. The battery sounds healthy for the first few minutes of me trying to start my car, but will eventually start sounding sluggish after awhile.

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The car did this last winter (in Colorado, so milder winters), but I could usually get it started once the sun came out and warmed my car up. Now, in Wisconsin (nights are getting VERY cold), it just absolutely will not start. I once got it to start by pushing it into a garage, closing the door and running multiple space heaters. After a few hours, it started.

If it DOES start, it will not repeat the problem again that day.

I’ve gotten my battery tested by 3 different shops, and all of them say the battery is completely fine (battery is less than 1 year old). I have tried trickle chargers and jump-start chargers; neither have worked to get it started. I did have quite a bit of green corrosion on the battery after a long road trip (2000 miles) once, but I completely cleaned the terminals. Recently, I cut the rubber around the battery cables, just below the terminals, and noticed that there is corrosion on the wires.

The alternator was tested, and fine.

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ALL my spark plugs and spark plug wires were replaced within the last 1-1.5 years.

I can hear the fuel pump kick in when the key is turned, and I have no other symptoms of a bad fuel pump (I’ve tried someone banging on the gas tank with a rubber mallet while trying to start it; leaving the key in ACC for a few seconds before starting; adding fuel injector cleaner in the gas tank when I can actually get it started; added Heet to gas tank; none of it helped at all).

I am leaning towards there being a weak connection because of the corroded battery cables, but I’d love a second opinion. I’m afraid to take it to a mechanic, because I don’t want them to replace the fuel pump just to find out it wasn’t the fuel pump…

Thank you for any advice!!

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