Recent content by Firebirdracer82

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    [SOLVED] Continuing the Mystery of a 2003 Tahoe with electrical issues

    Correct the prior owner swapped the trans and didn’t bolt back this ground. Think it had intermittent weak ground sitting on the block but that ground was the one.
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    [SOLVED] Continuing the Mystery of a 2003 Tahoe with electrical issues

    That was it! G104 was disconnected by prior owner and got it done. Problem solved! You guys are awesome!
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    [SOLVED] Continuing the Mystery of a 2003 Tahoe with electrical issues

    Which one is G104? Drivers side engine block? I’ve done that one but might get in there and do it again.
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    [SOLVED] Continuing the Mystery of a 2003 Tahoe with electrical issues

    Here are the results across the headlight circuit measuring for resistance: Drivers side Low: .4h .4ground High Beam: .4h .4ground Pass side High beam .4h 1.3ground Low .4h 1.3ground It seems I have higher ground resistance on the ground side of the passenger headlight. I’ve...
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    [SOLVED] Continuing the Mystery of a 2003 Tahoe with electrical issues

    Update on the headlights 3v showing on drivers side. 12v showing on passenger side This is with lights on.
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    [SOLVED] Continuing the Mystery of a 2003 Tahoe with electrical issues

    I’ll likely have some time tomorrow and start tracing from that headlight back. It’s odd though that the AC also causes the reduced power. I was hoping they’d share a circuit. As to the other question there was a prior head unit in it. I’ve already ripped out any remaining parts of it and it...
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    [SOLVED] Continuing the Mystery of a 2003 Tahoe with electrical issues

    I forgot to add prior, but the driver's side headlight is very dim... much dimmer than the passenger side headlight.
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    [SOLVED] Continuing the Mystery of a 2003 Tahoe with electrical issues

    Measuring the power at the terminals when it goes into limp mode I do not detect a draw on power. It stays stable at 14.32v as measured at the battery terminals even going into limp mode.
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    [SOLVED] Continuing the Mystery of a 2003 Tahoe with electrical issues

    I've been trying to figure what is drawing power so badly, but I can't seem to find it. When I hit the AC or the headlights, it'll go into power saving mode but I do not know how to find what is drawing power - I used my multimeter on the battery and the battery volt does not drop when it goes...
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    [SOLVED] Continuing the Mystery of a 2003 Tahoe with electrical issues

    Light switch - basically turning on the regular headlights will put the truck into limp mode. Turning on the high beams by the blinker switch immediately kills the vehicle. I may go get it tested, but I pulled it out of my other 2005 Tahoe and it had been doing great. I can check in the red...
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    [SOLVED] Continuing the Mystery of a 2003 Tahoe with electrical issues

    I’ve tested the battery off and tested alternator (can’t remember exact values but holds 12.5 off and 14.5 running). Have not looked at voltage drop yet since I can’t seem to isolate which system is the problematic one (headlights or AC unit head)
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    [SOLVED] Continuing the Mystery of a 2003 Tahoe with electrical issues

    Hi All - so the Tahoe I got now runs... kinda. (2003 Z71 with 184K miles) What is happening: Runs great and shifts great until... you turn on the AC, turn on the headlights at all. It goes into reduced power mode when you do those things. If you hit the high beams then the thing shuts down...
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    [SOLVED] 2003 Tahoe - Slow or no crank, no start (already tried a lot of the easy stuff)

    Ended up solving it…. Kinda. I had ordered a new battery ground when I got the truck and figured what the heck, throw it on, and it started. Runs relatively decent. The only problem now is when I turn on the AC it goes into reduced power mode. But I can work with that… over time. Thank you all!!
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    [SOLVED] 2003 Tahoe - Slow or no crank, no start (already tried a lot of the easy stuff)

    I might go ahead and try to pull all the plugs but it’s almost like someone used a breaker bar to torque the plugs or something. Never seen anything like it myself. Honestly, it’s not the best vehicle but I’m only in it $1500 or so. Body is decent and frame is great. So I might try my hand at...
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    [SOLVED] 2003 Tahoe - Slow or no crank, no start (already tried a lot of the easy stuff)

    Measured resistance from battery ground to engine, within spec. .3 at the alternator case and bracket. I pulled the injectors and put them under fuel pressure to see if any were leaking but none leaking yet (was wondering perhaps if a leaky injector had filled a cylinder… does not appear so)...
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