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Have you checked the 4runner's battery yet?
Are the lights flashing on and off? Or are they flickering?
And all you did was replace dash lights?
Ok, let's start with some basics, do you have a multimeter?
With the key out, check the voltage of the battery and let me know what it reads.
Perfect, now is there a small red light to the left of the steering wheel?
Is this light also a button (you can push it in or out)
Is it flashing right now?
You are not getting enough amperage from that battery to start the 4runner, double check the terminal clamps for tightness and try checking the voltage with the key in the on position.
Also check that ground wire going to the fender, sometimes they can be broken and still hard to see that it is broken.
Hello and welcome to just answer and allowing me to assist you. You said the battery is ok? but how did you determine that ? did you do a load test on it ? or a starter draw test? these tests are very important to do for that exact problem, you stated that the battery has 11.8 volts, that is not enough should be over 12v . the load test will determine the strength of the battery under load not just voltage. the starter draw should not exceed 100amps. How old is the battery? If you require further assistance I'll be happy to do so.
You mean the relay in the fuse block or the stater itself ? because that is another problem we had was solenoid problems .I would replace that relay then before it leaves you stranded. But that battery voltage still bothers me.