Green light not operating is one clue, it indicates no power to the light, and if the light is connected to the pump, then no power to pump.
If you have a control system of sorts, then the control system may be bad.
If green light connected to pressure switch indicating good pressure then could be pump.
need to see where the green light gets power, or troubleshoot the pump and work backwards towards the switch.
A quick search found this link for the pump.
Aquajet 5502-AV15-0668 RV Water Pump 3.5 GPD 55-AQUAJET-AES 12 VDC - FreshWaterSystems.com
It looks like there is a built in pressure switch which is common for this type of pump.
So here is your list of tasks.
1. Check for 12 VDC ACROSS the supply leads. If you lost your ground you will have +12 volts on both wires, no ground is no go.
2. Get a couple sharp pins and carefully insert them into the wires going into the switch at the front of the pump (opposite end from motor).
You should be able to see 12 VDC on both wires to ground.
If you only have 12 volts on one, then touch them together, pump should run, if it does then the switch inside is bad.
If you have 12 vdc to ground on both wires you will need to trace the wires to where they enter the motor, again insert pins in the wires where they enter the motor, but be careful to not let them touch, you should see 12 vdc across them.
If you see 12 vdc, then motor bad, if not, then wiring bad.
For bad motor tap the end of the motor with a wrench or anything else, sometimes the brush gets stuck, it may start.