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OP: that is a strange one. If it starts with a boost ignore all electronics and concentrate on looking for a bad ground that is causing the voltage to drop when just off a battery. I could be wrong but I would guess a running car (boost vehicle) wlll deliver more than 13v because the alternator should be delivering 13-14. So if it starts with more volts then something, when just off the battery, is dropping a few volts and maybe not energizing the key pill. With a boost vehicle you will have more than 12v so you can afford to lose 1-2. With no boost vehicle you are getting less than 12v for some reason. Maybe to test this theory you can get some volts back on startup by pulling various fuses - radio - daytime running lights, interior lights, etc. And see if it starts.
Found this on the Interwebby: Fully charged automotive batteries should measure at 12.6 volts or above. When the engine is running, this measurement should be 13.7 to 14.7 volts.
Last edited by Porsche-Eh; 10-16-2018 at 10:37 PM.
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