Forget a blown fuse. They don't work sometimes and not others.
There's a few common things to look for. First, use an inexpensive digital voltmeter to measure the battery voltage. It must be 12.6 if it's good and fully-charged. If it's closer to 12.2 volts, it's okay but discharged. Charge it at a slow rate for an hour, then measure the voltage again. As an alternative, if the starter cranks the engine with a jump start, we'll have to move on to testing the charging system. This sounds like the starter is having problems or the battery needs to be load tested these guides can help us fix it.
https://www.2carpros.com/articles/starter-not-working-repair
and
https://www.2carpros.com/articles/car-battery-load-test
Please run down these guides and report back.
Look at what happens to the brightness of the head lights when you try to crank the engine. Do they stay bright, get dim, or go out completely?
Follow the smaller positive battery wire to the under-hood fuse box and be sure that connection is clean and tight.
Look in the under-hood fuse box to see if your car uses a starter relay. If it does, that will provide four test points to identify which part of the system has the problem.
Try shifting to neutral when you want to start the engine. If that works, suspect the neutral safety switch.
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Thursday, February 25th, 2021 AT 3:50 PM