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I hooked my battery up backwards now my engine won't turn over. Popped the wire from cylinoid to the alternator, spliced it back together. Still wont start bypassing battery to starter

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Hi Michael, Sorry to be the bearer of sad tidings but you have caused very serious problems to your vehicle. Every circuit which uses diodes and which were operational during your failed attempts at starting have probably been damaged. A diode is an electronic component something like a one way valve and can be compared with a water reticulation system. By connecting the battery the wrong way around the diode packs which convert AC current to DC in the alternator have been damaged. Likewise those in the computer, and any other electronic equipment which was turned on at the time of the failed attempts at starting will have been blown. The damaged components are not very expensive but to replace them will need a knowledge of electrical circuitry. If you have a friend you can call on to help you repair the damage, he or she will need to remove the alternator, computer, music system, climate control and any other systems which have failed and replace the electronic components damaged in those units. If you do not have a friend with that ability replacement of the affected units will be required. Sorry Michael Best of luck, John

Posted on Jul 20, 2013

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Posted on Jan 02, 2017

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if the battery is ok there could be one of two problems have you tried the spare key? it may be a problem with the immobiliser look at the red light near the time clock it should go out when atempting to start. second try tow starting or bump starting you may have a faulty starter motor do not try this to often or you could damage the cat. do you get any noises when trying to start such as a clicking ? this would indercate faulty solinode on starter hope this helps

Posted on Jul 15, 2008

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SOURCE: 81 toyota pick-up. No spark

Check to make sure the main fuse is good. Sometimes those blow when you short out a wire from the battery to the ground on the car *like when an alternators live wire hits ground on the car.
On a 1981 Toyota pickup, im unsure of where it is located, but sometimes they are located in the fuse box, as a big fuse usually a 100 amp or 80amp fuse.. Sometimes they are located along a ground connected to the engine and the frame of the car. This could make it just crank and not start.
Check also to make sure that the engine is grounded, by taking a test light and connecting it to the positive side of the battery, and testing the metal around the motor. Sometimes grounds can break, or when shorted out they can melt. If the motor is not grounded then it will not start. and will just crank.
Hope this helps a little - Jarett

Posted on Aug 17, 2009

  • 3018 Answers

SOURCE: I hooked my car battery up backwards on my 05

  • When you hooked the battery up backwards you blew the 100Amp main fuse. You have two fuse boxes. One under the hood and one under the steering wheel. i recommend a look at the fuses in general. Which that 100 Amp fuse may bring some life back to the car there could be some more stuff to look at depending on how much (if) any damage was done.

  • If you have any comments please feel free to leave them here.
  • Hope this helps and thank you for using FixYa.

Regards, Tony

Posted on Oct 05, 2011

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SOURCE: 2005 kia sedona wont turn over wont start, just

check to make sure the main wire going to the starter is tight mine was corided and did the same thing ..just a thought

Posted on Apr 22, 2012

  • 633 Answers

SOURCE: 2003 cts wont start. i jumped the starter and won't turn over. Battery says 11.9 volts could it be the battery or starter?

Battery voltage is definitely and issue. Charge your battery and have it tested before condemning the starter.

Posted on Jul 08, 2012

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Hooked up battery backwards on my 1992 ford explorer. Got it running now the alternator isn't charging the battery. Has 12 volts power. Could it be the points on alternator where the wiring hooks into...

The battery needs 12.6 volts or more to be in service
When the engine is running you need 14 volts or more
out of the alternator to charge the battery
You can test the alt by testing across the battery term
or the alt output wire & ground to case or motor
Could be the diodes got fried & you need a new alt
Have it tested at parts store, if you can't figure it out
Check all fuses & fusible links first

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That wire was probably a fuseable link which is designed to melt inside like a regular fuse.
Do you have voltage on both ends ? And are the other fuses getting power ?

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1998 Ford Explorer 5.0 battery won't charge,

Probably because your Battery is Bad... Try Charging and LOAD TESTING our battery and then if the battery tests good, Test your Alternator and see if it is charging properly.

Maybe when you installed the New Alternator, you missed a connection or have too many wires on one connector... You have have to take some pics to see what is going on.

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Sep 15, 2012 | 2002 Chevrolet Blazer

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The battery has tested fine, the alternator is fine. But it won't start or hold a charge.


Aug 27, 2011 | 2005 Ford Ranger

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Put in a new atl wont charge

If both the alternator and the battery are good, either the alternator isn't turning fast enough (slipping belt or engine idle speed too slow), or you have a wiring problem.

To check your wiring, look for the "1" terminal on the back of the alternator (left side of spade terminal connector). When you turn the ignition key to the run position without starting the engine, the alternator warning light should be at full brightness. If the bulb is burned out, the alternator will not get the excitation current it needs to start up (it goes through the bulb). With the engine running, you should measure 12 Volts at the 1 terminal (this is the excitation terminal).

Another thing to check is whether the battery charge wire is good. If it is corroded inside at the battery clamp end or burned out, you won't get charging even though the alternator appears to be working. If you don't have an ohmmeter, you can make a quick test by adding a new 8 AWG wire between the output terminal and the battery clamp. If the battery now charges, the original wire is bad. If this works, I recommend installing an inline fuse at the alternator end no larger than the largest size used in your electrical system, just in case something happens to the jumper wire. That way you won't burn out your alternator.

The heater/AC issue could very likely be a separate problem, but inadequate power may keep that system from running properly. (Note: low idle speed or belt problems will also be detrimental to AC performance.)

Jul 10, 2011 | 1989 Chevrolet Corvette

1 Answer

Iv got an k5 blazer 1983 model. Iv got power from the battery to the cylinoid but after that their is no power running through the rest of the engine!

The first thing to do is make sure that all the connections at the starter are good, secure on the connectors and free from corrosion. Quite often the connections will look good but there will only be 1 or 2 wires in the strand that are while the rest have either broken off or corroded. Clean them up before you put them back on.
If that doesn't help, there are 2 fusible links in the harness at the starter. One is for the engine and the other is for the rest of the electrical. You are loking for a small rubber plug on a section of 2 red wires. Cut them out and splice the wires back together, one at a time of course. Use "heat shrink tube" to seal the splice before you tape them up. It seals a lot better and will help keep road grime out. Hope this helps.

Nov 19, 2010 | 1983 Chevrolet Chevette

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Alternator wire...

You should remove your alternator, and have it checked at a local auto parts store. They usually will check them for free. Most likely you have a damaged voltage regulator,which is part of the alternator, and that is what is draining your battery.

Nov 30, 2009 | 1988 Ford F 150

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