Equinox won't start

Hello, you've replaced the battery and alternator. What testing has been performed to see if either one of those components has failed? Replacing your battery with a proper battery is never a bad idea. They can always be upgraded, even if the battery was never the root cause of failure. At the same time - was it tested by a quality tester? How did it read? Replacing your alternator should only be done if you've verified that reference voltage output and amperage output at 2,000 RPM of engine speed is below specifications. What is the output as measured? It's all a bunch of guessing unless you test and measure and verify. Yes, you could have cabling issues - corrosion issues - melted rectifier connector at the alternator causing circuit issues, and who knows what else. www.repairpal.com/repair-shops