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First use a multimeter to test the voltage at the battery. Make sure that it is still at least 12V. Then on the top of the engine there should be a 50A breaker. Check both sides of it for power. If there is not any power at all to it, there is also a 90A fuse on the starter, check it to ensure that there is still at least 12V to both sides of it. If there is not, replace that breaker.