Hi, concerning the left turn signal, this is caused by a faulty or defective flasher relay switch. this is easily replaced and once replaced with a new relay, it will fix this erratic flashing issue you are having. Now, concerning the gas gauge issue. the reason for the non response here is because of a malfunctioning sending unit that is located inside the actual tank. it is part of the fuel pump assembly and it will need to be replaced.
OK, this is concerning the dead radio issue. i would first check the fuse to see if it is ok. if the radio fuse is fine, this will more than likely be an internal circuit issue within the radio itself and, you will have to replace the factory radio. most factory radio systems tend to get really hot and this is not good. it usually ruins the internal circuit board in time, completely rendering the radio useless. i would still make sure the fuse is good. it could be as simple as a blown radio fuse. i will post a step by step guide below that will help you replace the flasher relay.
FLASHER RELAY SWITCH REPLACEMENT GUIDE--
Step1
Locate the fuse box under the dash on the driver's side of the Caravan. Look near the emergency brake.
The fuse box cover has two finger screws that you should loosen to
remove the cover. Inside you will see a collection of fuses and in the
upper right corner a few relays.
Step2
Find the turn signal hazard flasher relay in the upper right corner of
the fuse box. It should be easy to spot as it is the biggest of the
relays in the box. Remove the relay and replace it into the socket from
which you just pulled the bad relay. The placement into the socket is
tight and can be difficult, but be patient and take your time.
Step3
Look to make sure it ended up in the correct position. Close the fuse
cover and tighten the finger screws. Start the Caravan and test all the
light functions. Make sure that the turn lights blink and that the
hazard lights work properly.
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