I have a similar problem with my van. What is happening, is that there is a weak connection, that sometimes (or almost always, in some cars having this sort of problem), not enough current gets through to the starter or other engine parts, so once the current draw is too high for the weak connection, everything acts like the battery is dead. It is very difficult to track down because testing for continuity acts as if all connections are good, because there is still a connection, it just cannot handle the needed current.
In my case, simply moving or bending part of the wiring harness close to the battery makes everything work fine for about the next two to four weeks, until it works loose again. In my case, I need to replace that part of the wiring harness. I just have not yet done this myself yet due to finances and available time.
I know it sounds strange and you wonder how power to the starter or engine could affect the other parts, but it does. Not even as much as the dome lights would come on, once any part of the engine takes enough power to cause the broken, frayed or weak wire inside of the loom to seperate.
On some vehichles, a possible work-around could be to first check to make sure all connections to the starter motor are good and tight, and if the problem still happens, then get a somewhat universal starter cable that connects between the battery and starter. The "propper" fix, however, is to replace the entire wiring harness if it can be afforded.
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