Dash lights blink on and off

Hi I’m having issues with my electrical my battery light came on. Had it checked out. Replaced battery and alternator . Both working fine. Light on still. It goes out when I hit the brakes. And comes on again. While driving I had a acceleration issue it run rough for a second then reved up and slammed into gear . Has an auto trans. That happened once. Then a day later as I was driving home the check engine light came on it was going on and off. But truck was running fine. As I stoped at a light the dash lite up like a Christmas tree all the safety lights castrates blinking intermittently.

 

Dash lights started blinking intermittently

 

Bad alt. I changed mine and it lasted sixty days! Time for another

 

Hey john . Tim here . Thanks for the quick reply. Yea the alternator has been changed twice . Tests good.

 

Bad ground maybe

 

maybe a bad ground, maybe bad network communication between module(s). Scan for DTC's thats hopefully stored in memory

 

Hey out there my name is Tim I’m a new member. I have a 2015 Tacoma 4x4 it’s my 4 th Toyota truck in the last 30 years. I’m in the Ventura area I’m not a mechanic but have done a fair bit of repair work in the past. Lookin for some advice with what seems to be an electrical issue. I’m starting to lean towards a bad ecm since I’ve already addressed the usual diagnosis like alternator and battery . Battery light still on. And recently the truck was slow to accelerate then reved up and piped into gear on an automatic tranny. But only once did it do that. Then next eve the check engine light came on. But intermittently. Then all dash lights went on and off . Started truck fine this morning no dash lights on?

 

Got a p504 code in hisory start malfunction. And a brake switch malfunction code.

 

check the connectors at the brake pedal switch for corrosion...

 

If you're good with a mulit-meter i would suggest doing a pinpoint test of the brake pedal switch following the FSM's procedures..