PLEASE NOTE: I already managed to fix this issue, but I can’t seem to figure out why it fixed the problem, maybe one of you can help me find the reason in order to improve my understanding of vehicle electrics.
The car in question is a 1990 Mazda MX-5 Miata with a 5-speed manual transmission and a 1.6L engine, completely stock.
Back in August this year, I had three occasions where upon starting the car, it would (attempt to) start to crank and completely lose power. By losing power I mean that the starter, instrument cluster, HVAC, radio, power windows (basically, everthing) permanently lost power. The power would fully restore after reconnecting the negative battery cable. I first took my battery to a repair shop for a load test, and it still was in good condition. After the third time of this happening, I cleaned up both battery posts and it has not happened again ever since.
I’m quite glad I managed to get it fixed with such an easy fix, but up to today I have questions on why I fixed it, and hopefully someone here can help enlighten me. The main question that is still stuck in me: Assuming I had a bad battery post connection, how can all my car’s electric systems stay completely out until I reconnect the battery post? Permanently lowered voltage? Something else?
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