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I hooked up battery charger backwards

Reversed polarity on my battery from charger Now it won't start and lights don't work

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: hooked up the battery reversed polarity. Blew the fusible link but replaced it. Now the car will crank but not start.

start checking fuses hopefully its just another blown fuse if your lucky

but if all the fuses are good, you probably fried something like the computer or ignition module and probably the radio

hopefully its something simple and cheep but don't be surprised if you have to shell out some cash to replace the computer

Posted on May 16, 2009

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SOURCE: reversed polarity on 2000 mazda millenuim, now my car wont start

who ever made the new battery has accidently mad eit with reversed polarity there is a way of changing this i think you just charge it with the reverse polarity minus to positive ect

Posted on Sep 01, 2009

  • 286 Answers

SOURCE: polarity reversed on power seats

It shouldn't be possible to invert connector plug but what ever you did prior to this situtation is suspect ! Try reversing the plug wiring , It's designed to turn in both directions and will not damage the motor ie back / forward. Good Luck

Posted on Apr 11, 2010

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SOURCE: my brother hooked up the

At the starter relay on the fender that the positive wire goes too ( it's short) there's several other wires under the same bolt. These are fuseable links and should be replaced with the same kind of wire. Theirs likly maybe two of these wires burnt in two. If your luckly the fuseable links burnt though and the alternater and the cumputer weren't burned up. With the wire replared and when you go to connect the battery make sure the key is off and lights and doors are closed and strick the cable to the battery post to see if it sparks. It it sparks very much at all won;t connect it but put a test light bewteen the cable and the battery post and it'll light. if it's bright something is on. If the altenater was damaged it may be on so diconnect it. The big wire on the altenator, If the test light is still on keep pulling fuses and disconnecting things till the light goes out or is dim. them connect as much as you can and light light remain dim or out till you have as much as possible connected then try to start the truck. If it runs now check to see what doesn't work and see what it takes to fix or replace them and your back on the road.

Posted on Dec 05, 2010

duane_wong
  • 6826 Answers

SOURCE: car battery installed backwards -

I'm sorry to hear that that happened to you. I think that when opposite polarity blows a bunch of fuses, and smoke pours out of the dash, it's a worst case scenario.

I've seen what electrical fires can do to wiring, and it's not pretty.

I'm not sure about the Chrysler 300 from 2005, but commented anyway.

Good luck on repairing this problem. You may need the assistance of an auto electric shop.

Posted on Dec 12, 2010

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Someone hooked jumper box up backwards on van and tried ti start it it ran great before that after it wouldn't start at all changed the computer now it starts runs a few mins then shuts off what could it...


You will have to take it to the Dealer. You may have burnt out or the "Control Module" needs to be replaced or reprogrammed. Make sure the battery has not reversed polarity also.

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Was the battery IN THE CAR when it was being charged? If so, I'd say you might want to call a shop. It may have fried all kinds of things. I've seen cars run with the battery cables on backwards, they just couldn't hook up a car stereo in it...but that was a much older car without the computer components we have now.

About the only thing I would do if it was me, is get a new battery and put it in it, hook it up properly and see what happens. You MIGHT be very lucky. If it won't start or run right, then call a shop...sorry.

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You have reversed the polarity for the CPU in the ECM This causes problems with the program at best and at worst will require a new ECM. Use a scanner to see if the program will reset and if not have the ECM checked for operation. You may have to have the alternator checked as well as reversing polarity blows rectifier diodes.

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You need to charge your battery up more. Either get a battery charger or leave the jumper cables hooked up for a longer period of time.
Your battery was probably completely dead. You might even need a new battery...they really don't like to be completely drained.

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I hooked jumper cables up backwards being in a hurry. I blew the 100 amp main fuse and replaced it. now the lights and blower fan work but the car won't turn over and the clock and radio don't...


It sounds like you blew fuses other than just the main fuse. Hooking the battery up wrong can destroy major components as well, like the starter, battery, Computer, moduals. You might need a good shop....

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reversed polarity,check fuses. check the system for burnt wires also !
Always hook up your battery terminals correctly, as the alternator may be damaged if the battery is hooked up backward. jump start car, if it will. there should be at least 13.7 to 14.2 volts at battery posts while its running. if alternator is ok.

Nov 01, 2011 | Cars & Trucks

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Not able to get any read from an OBD2 meter (blank) May have damaged the ecu when cables were crossed while jump starting. Alternator is good (bench tested). Brand new battery (batt 100A fuse replaced)...


I've seen a handful of vehicles over the years where the jumper cables were accidentally hooked up backwards, even for a split second, and the damage done has ranged from none [other than some nasty sparks] to severe where the engine/transmission computer were damaged by the reversed polarity. Because you're unable to read any data via the OBDII connector I would suspect either a blown fuse or fuses or a damaged computer. I'd check all the fuses first then if things still don't work you may have to have a service facility do some further testing to see what is working and what isn't as far as computer inputs/outputs are concerned. Sorry that I don't have an easy fix for you but hope this helps a little bit!

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