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!!
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This will require the use of a wiring diagram and a multi-meter. You can request a diagram here: http://freeautomechanic.com/wiringdiagrams.html
Reference link, how to use a multi-meter: http://freeautomechanic.com/wiringproblems%206.html
If you do not have the tools or knowledge then you should have your mechanic take a look at it as it is not going to be quick easy fix.