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Do look at that diagram for the USDC.
The DSATX has a 10 second timer on the low voltage setting for cranking. Basically if you crank for less than 10 seconds, the voltage could drop down to 8 volts and still not hickup or trigger the low voltage setting. Bascially when the battery is getting low, it has to stay below the threshold for 10 seconds before it is actually a low voltage condition..
The ACC line has 1 second of hysteresis so you don't actually need a make before break switch. Any SPDT (Single pole Double Through) switch will work.
Make before break might acually be damaging to your car system because your ignition line will go high without the key actually doing it which could cause weird results..
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