Question 2007 tundra electrical problem

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Thread: 2007 tundra electrical problem

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    Default 2007 tundra electrical problem

    My problem is the dash and head lights flicker while driving and sometimes they will go out momentarily along with the radio and gauges, the engine speed and performance are not affected. The battery is fully charged and the alternator is new and load test good. Any help would be appreciated.

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    Lurking Member Phreak's Avatar
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    Default Re: 2007 tundra electrical problem

    Sounds like a bad ground to me. I don't think the headlights and the dash lights are on the same circuit so it would have to be a major ground if it was. Unfortunately I'm no expert, I turn to these guys for all my wiring advice. Someone here will have a good idea I'm sure.
    2008 Crewmax SR5 TRD, Flowmasters, Leveling kit, Blacked out grill, Plastidip OEM Wheels



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    Default Re: 2007 tundra electrical problem

    I was thinking a ground issue but all the grounds are clean and tight, the flickering and loss of the lights can be affected by acceleration also.

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    Default Re: 2007 tundra electrical problem

    Still haveing this problem, dash and head lights flicker while driving and sometimes they will go out momentarily along with the radio and gauges, the engine speed and performance are not affected. The battery is fully charged and the alternator is new and load test good. Any help would be appreciated. the problem is made worse with acceleration. I have a after market remote start with the security bypass for the chip in the key, could the bypass be going bad causing problems? Any help would be appreciated.

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    Default Re: 2007 tundra electrical problem

    Ask MENDONSY, who is the keeper of all things electrical............
    mendonsy likes this.
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    Tundra Tin Man

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    Default Re: 2007 tundra electrical problem

    Quote Originally Posted by NJGUY122 View Post
    Still haveing this problem, dash and head lights flicker while driving and sometimes they will go out momentarily along with the radio and gauges, the engine speed and performance are not affected. The battery is fully charged and the alternator is new and load test good. Any help would be appreciated. the problem is made worse with acceleration. I have a after market remote start with the security bypass for the chip in the key, could the bypass be going bad causing problems? Any help would be appreciated.
    Sorry to hear you're still having problems. FWIW, there are hundreds of grounds on this truck. I'd take a guess and say you've probably got an intermittent ground somewhere in your dash that's in common with your dash lights, headlight switch, radio, etc. The fact it's worse when you accelerate may lead one to believe it's also vibration related. I've attached the schematic for the Gen2 Tundra which might prove useful.

    Unfortunately, the fact that you've had an aftermarket remote start installed kinda complicates things because it may add another variable into your problem equation. There's no telling what he may bumped, disconnected, and/or modified. Unless the person who installed your remote starter gave you a schematic of what he installed it may make troubleshooting more difficult.

    Good luck!
    Attached Files Attached Files
    Last edited by 11Tundra; 01-30-2013 at 04:34 PM.

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    Default Re: 2007 tundra electrical problem

    Thanks TTM!! I was just looking in my PDF library on TS for the wiring diagram.
    I am inclined to agree that it's a connection problem. Maybe this wiring diagram will help you find it.
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    Default Re: 2007 tundra electrical problem

    i had a similar problem after i installed a new alternator but i never experienced them totally going out. even though im not a 2nd gen owner i would take a look at the harness plug that is on the back of the alternator. this plug it what tells you if the alternator malfunctions like if the belt flies off and brings up the battery light on the dash. without it making a good connection it can cause the alternator to cycle on and off rapidly or even go off for a few secs and then flash back up.

    but most likely its a ground issue but this is worth a shot to check off the list of things to check.
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    Default Re: 2007 tundra electrical problem

    The second I read after market remote starter I question the installation and its connections. I would start there and see how it is tied in and confirm the connections are sound and secured especially since you mention acceleration affects it and probably rough roads. That is where I would start.

    Your headlights probably flicker with the dash because the dash powers the headlight switch and relays for them.
    Hewitt Tech Inc Webstore Home of the Original SAIS Bypass Kit

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    Default Re: 2007 tundra electrical problem

    Thanks for all the help, I have a lot to work with now and the diagrams will be a big help I'll update you if I figure it out.
    DanielAcosta likes this.

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    Default Re: 2007 tundra electrical problem

    Did you ever find an answer to your problem? I have had similar symptoms on mine and believe it may be the alternator getting ready to die.

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