Hi...The RED light is the CHARGE light, the ORANGE light is the OIL light.
Is the battery running down ?
If the RED light is on that could be one of two things or two things.
1. The alternator isn't charging - It's Broken it may be answers 2,3,4
2. The alternator belt is slipping and needs tighting
3. Water o the rainy day is splashing on the electrics causing a short.
4. Water on a rainy day is making the belt slip.
Does the RED light stay on on tick over and go off when you rev ?
Is there a sound like a cat being killed coming from the belt ?...This is the belt slipping.
NEVER PUT YOUR HANDS UNDER THE ENGINE BAY OR NEAR ANY BELTS OR PULLEYS WHILST THE ENGINE IS RUNNING- YOU RISK LOSING A FINGER.
My advice : Get someone you can trust to try and tighten the alternator belt, check for wear and replace if need be.
Check underneath to see if a splash panel is loose, and allowing water to splash on alternator.
Failing that get somebody to put a electriacal tester on the battery and check for a charging voltage.
Good - Luck