Dont do anything until you either replace the battery cables and connections or verify their integrity etc…I cannot stress the importance of this enough…but I will try… LOL.
If you have a lot of corrosion…that corrosion can really play tricks on you… even if the external evidence of corrosion is removed sometims the corrosion is actually between the end connector and the factory wire…UNSEEN and ignored. These weird things will wreak HAVOC on you and the vehicle until you make absolutely CERTAIN that the connections are solid…Or go insane…or sell the car…or all of the above. The main connections (esp after any kind of damage or noticeable corrosion etc) must be Solidly doing their jobs… there are ways to root this out…but it is time consuming and takes a “Good Mechanic” to repair sometimes. The connects need to be clean and tight not just shiny and clean looking but absolutely certain they are doing their collective jobs… I cannot stress this enough.
NOTHING will work properly if the connections are suspect…NOTHING. You will be given a never ending list of Possible suspects…and know what? Most of the ideas people throw at you will “In a way” be correct… When you have questionable connects to the battery and ground…Every single electrical component in the vehicle can present you with a symptom that seems completely logical…Electricity can be VERY Mischievous when you allow it to be.
The connections at the battery BOTH of them… Absolutely Positively…and Negatively need to be Unquestionable in their integrity before you try to find any kind of other culprit.
I repair a lot of vehicles that dealerships and small shops declare a total loss and Un-Repairable… Not because I am “The Man”… But because I will and am able to go deeper than most shops would ever consider… These are dangerous waters for sure… but when someone declares that “NO ONE can figure out the problem of my car”. They usually wind up in my hands if they speak to the right people. See its not profitable for shops to try to diagnose and repair some types of issues…it simply isn’t feasible sometimes. But my “Clients” are usually friends or friends or family of people who know me personally…so they know that when it gets to me that the issue will be identified Simply out of sheer Tenacity, Enthusiasm, Curiosity, Logic and a little Pride in my work as well.
I’m not Boasting…I’m basically saying that some or rather MANY shops do not want to even take on certain types of jobs. This issue can be one of those types of problems…for shops…they will throw parts at it and basically guess at the culprit when it is a rather simple electrical connection issue that will manifest in very Complex and strange ways. I CANNOT STRESS ENOUGH…how important the integrity of your electrical connections are at the Battery and Alternator…all the way to the starter…which along with the Alternator has a “HOT” line to it at all times. The Ground connections are equally important… Neither takes president over the other…those two are always equal and rely on each other…quite literally. So don’t focus on just one side of the battery…(Me speaking to a mechanic)
So…basically since I can type very fast…I wrote all of the above… Just to say… Make CERTAIN of the integrity of your battery connections and grounds… I could tell crazy bed time stories for a solid month on some of the things I’ve seen that were a direct result of the Main electrical connections… REALLY funny stories too Not only what happens in the car but even more funny are the Superstitions the owners start to adopt to “Make it work when I do this” type of thing… Some of these stories will make you HOWL with laughter.
One last clue… Check the Main connections…and BE CERTAIN of their integrity…Literally buy new factory cables if need be…(salvage yards come to mind). Battery Cables and Connections…as well as the Alternator and Starter (Both HOT at all times). Look for any kind of physical wire damage (which includes corrosion) The wires that split off of the Main Positive cable to feed the under hood Fuse box also will be affected when corrosion makes its prescense known. Sometimes the HOOD hits the top posts of the battery when batt not screwed down…or incorrect batt installed… My Goodness…I have seen so many things it really is crazy… Sorry this is so long…but I tend to ramble…sorry… LOL