I have a 2000 grand caravan. the gauges on the panel keep going in and out. the engine is a 4cylinder. the lights work the heat won’t work due to the gauges not working. the back window wiper or rear defrost will not work. need to know what can be check and need a local mechanic to change. I have check the fuses. no fuse blown. believe it’s the ignition cause I can turn on the vehicle, it starts but you can see that the gauges try to work once the key is in. need help!!