First Officer reported they almost taxied onto a runway MYNN airport without clearance as a result of faded runway hold short lines as well as a lack of illumination on signage.

Narrative

I was PNF/FO (Pilot Not Flying/First Officer) running checklist off north entrance FBO ramp. Taxi instructions were to taxi 14 hold short 14/32. It was dark. I was heads down at the time the PF (Pilot Flying) stated something along the lines of I think that was a hold short line. I immediately looked up to see runway 14/32 in front of us. I stated stop". We stopped approximately 20-30 feet short runway 14/32. A couple seconds later tower cleared us to cross 14/32. Tower then asked if we saw hold short line. I stated that it was faded and that we saw it. I also stated that we were holding short runway 14/32.Faded runway hold short lines between a FBO ramp entrance and runway 14/32. Red runway hold short signs unlighted and tall grass surrounding them both. No yellow wig wag lights installed. My head was down during taxi checklist operation.Repaint all runway hold short lines on MYNN aerodrome. Fix back lighting existing runway red hold short signs. Cut grass around runway red hold short signs."