Ouch! Okay, do you have a volt meter? If so you need to check the voltage at your fuse box to make sure that you are getting power to fuse panel If you are getting power to the panel, then you have to diagnose the power issue from the fuse panel to the radio and dome lights. All the lights not working? The radio may have an in-line fuse as well. If you don't have a volt meter, go get one.
I just accidentally also hooked up the battery, reversing the polarity....and radio and interior lights don't work....any suggestion how to fix it?
If there is a fuse box, do the same as I wrote above. If you have several fuse boxes, check all of them. What year and make vehicle do you have and maybe I'll can be more specific.
Mazda MPV 2001
Okay...I'm not an expert with Mazda however I am with a circuit. An automobile is a direct current circuit. The DC circuit is designed for current to flow in one direction. When you connect the current to the ground, 12 volts of energy flows backward directly to the starter or the junction relay for the starter. Under the hood there should be a fuse box next to the battery or somewhere under the engine compartment that contains relays and very large fuses. Not the small ones you are used to. Locate this box, locate any and all starter relays and fuses. Remove relays, should be only one or two and check impedance. Usually relays won't be damaged with reverse flow. Also, there may be a chassis ground strap with a fused connection...check for it.
Oh, by the way. Although not good, manufacturers anticipate this very thing and build in safety mechanisms. If you can't figure it out, go to the Mazda dealer, speak with ask to speak with a mechanic and he/she will tell you what fuse to replace.
Actually, disregard what I just wrote. That was only if the car didn't start. Just locate and replace fuses....no big deal.
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