| Make sure the battery terminals are clean. Often this overlooked but it doesn't take much corrosion to cause a resistance problem. I've seen positive battery terminals have corrosion that you wouldn't think does much of anything! But, the car won't start and it almost seems like you've got short. Starter clicks, but won't turn over. Yet most other things work fine. So, what do you do? You test the battery. Only far too often we take the voltmeter and read the voltage at the battery via the POLES of the battery. If we get a good reading of perhaps 12.4V. We think the battery is OK (and it is)... Only the corrosion on the terminals can create enough resistance that it is possible for the terminal connector itself to become hot! A good way to verify if you've got resistance there is to test the voltage of the battery at the pole, and then also test the voltage of the battery somewhere on the clamps, or if you can see the wires itself, at the wires. If for some reason the postive pole reads 12.4v and the reading at the wire is 10.5v, you've got resistance and this will cause your car to do funky things. Same thing can happen on the ground side with corrosion. Just make very sure that the terminals are clean, and that you have proper voltage not only at the pole of the battery, but at the positive wire itself or at the very end of the connector, etc.
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