I’m betting this is probably the problem and you’ll need a new starter motor installed. These contacts failing is a common car problem, and often produce the exact symptom you are reporting.
If that’s not it – unless someone has been messing with the wiring and connections to the starter motor recently- the next step would be to test the starter selenoid contacts. Make sure the battery connections are clean and tight. The starter motor draws close to 100 amps, so even a 0.01 ohm resistance produces a 1 volt drop, which will noticeably slow down many starter motors. You’ve got a connection not making good contact somewhere. You could have them test the charging system too while you are there. If that battery had managed to pass the load test, they would not have honored a warranty replacement.Īuto parts stores will do a battery load test usually, for free. My best guess is a bizarre short in the battery that was killing alternators. Once the new battery was in, the alternator no longer had the hum and the amp draw was a respectable 25-30 amps. Once it ran the load test, the results came back 70% capacity. The electronic tester they used called for a 30 min charge before it would test it. It checked out voltage-wise, but I had them load test it anyways. I pulled the battery, and took the client to the store he purchased it from. We shut it all down and checked everything we could. My ammeter told me it was pulling over 95 amps. We put a warranty replacement alternator in the truck, and it too had that strange hum. It jumped fine, but the alternator was fried again. A couple of hours later, he called with the truck not able to start. But, it tested fine, and we sent him on his way. We replaced the alternator, but noticed the new alternator had a strange hum. It may be a matter of letting the alternator charge up the battery that helps cover the bad condition.Ī bad battery case: I had a client come in with a fried alternator in a Ford Explorer. Take the battery out and use another car to take it to the store for an immediate load test. The next time you experience a slow start, don’t let the engine start up. If the battery passes the load test, which means it can deliver the CCA that the battery is rated for, chances are it is not the battery, and they don’t feel obligated to replace it. A load test is the standard that these stores use.
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