When does it try to start by it's self ? All the time ? Have you had any water leaks around the windshild ? You say last rainy season is when this started to happen , I would look at the central junction (fuse) box under left side of dash for water intrusion. Fuses 20 & 21 . Starter electrical circuit wiring diagram shows both of these fuses can supply battery voltage to the starter relay . 21 is a 15 amp fuse , 20 is a five amp fuse . 21 would get battery voltage when you turn the key to the start position . Both feed circuit 325 to the transmission range sensor ,from there circuit 1093 feeds to the starter relay . Battery voltage on that circuit would energize the starter relay turning on the starter an spinning the engine over . There are four connectors that circuit goes through , c172 , c182 , 158 an c243 . You would need to know where these connectors are located on your vehicle to do voltage testing , to see where battery voltage is or where it isn't suppose to be . Lots of videos on youtube on electrical circuit testing , buy a DVOM - digital volt ohmmeter , get a service repair manual an test the circuit .
Testimonial: "The first time tried to start by itself were raining and i were inside the house, even not were with key on ignition. Were so scary indeed. I run to to check and headlights were on and dash instrument were like crazy. I run to take battery pole off. After that i waited days after weather improved. I keep it at sun waited till full dry as one mechanic said may be the car had a leak near wires or something. After done that i tryed the car and worked fine, but after days then did it again and i notice when humid weather, rains start it again. I notice car had humid smell inside but were not able to find if the is a leak somewhere exact. This has been a nightmare since. I took it to a mechanic and said will start testing and will so expensive to find were is the short etc. I paid $80 to one just for come an look didn't do anything its so disappointing. I love this truck i don't want to get rip of it. I really appreciate so much the information ill keep on post what i find starting on the fuse box, Thank u so much!"
Wiring fault or ignition switch I would suspect.
Testimonial: "Thanks for answering my question. The thing is i replace the ignition switch, the solenoid and didn't fix the issue. I tock the car to a mechanic and said its will be very dificult fo find the short and very expensive. I love my truck and i would love to know what is the issue. By the way the problem started on the last rainy season. Thanks in advance for the help"
In that case, I would check the wiring harness for damage and look for corrosion from the water ingress.
Thank u so much for the information. I wish i had electromecanic knowledge to find and fix the issue. Ill keep on posting what i find, thank u so much!
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