My DCDC charger is discharging my cranking/starting battery too farUpdated 3 months ago
The ignition cable may be connected to a source not controlled by the ignition. This may give your charger a false reading and cause it to drain your cranking battery too low.
The easiest way to test this is to completely disconnect your DCDC charger from the system and leave your vehicle overnight. If your cranking battery is still losing charge, then there is an internal issue within your battery, or there is a parasitic load drawing from it.