#1... if the battery voltage in as low as 12.15 volts at rest (no loads on the battery and no recent loads either
*) get your hands on a good battery charger quick! That is too low a voltage for an FLA (flooded lead acid battery). Very bad for them. 12.15 reflects a state of charge of about 55 - 60%.
If you have FLA batteries you should also have a good hydrometer.
This is an excellent choice.
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It's always read around 13.4 or so
When?
When the PD was plugged into shore power?
When the trailer battery was receiving power from the TV with the engine running? (if there is a 12 VDC hookup between TV battery and the trailer battery)
At rest you'd expect a reading of around 12.7 volts for a fully charged 12 volt FLA.
When you first installed and hooked everything up what voltage reading did you get? At the battery with the PD on shore power?
I thought the pd4045 was supposed to charge while on shore power??
IF the battery is not fully charged there should be a noticeable charge going into the battery when the PD is on shore power.
The fan won't spin if the battery is charged. It only runs when the PD is working at charging and gets warm/hot, IIRC. If you have a low battery (12.15 volts) the PD should be working pretty hard to recharge when plugged into shore power. Begin with checking the tightness of the connections and if everything is correctly connected.
* a minimum of an hour rest is needed to get close to having an accurate voltage reading. Trojan recommends a 6 hour rest at a minimum and states 24 hours is best.