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  1. #1
    SE Level Member ELECTRICxWIZARDx's Avatar
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    Default Help with ground points.

    I need help finding all the ground points. Document I have only details location of 100 series grounds, under hood.

    Where are:
    [AS LABELED ON WIRING DIAGRAM]: G200, STEERING COL GROUND, G201, G205, G301, G302

    Any help on how to test for the presence of voltage on the ground circuit, indicating voltage drop?
    Black 2001 GTP Sedan
    Bone stock... for now.

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  2. #2
    Killa Bee Scottydoggs's Avatar
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    Default Re: Help with ground points.

    how about we start with whats wrong with your car?

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, 2.8, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW

  3. #3
    SE Level Member ELECTRICxWIZARDx's Avatar
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    Default Re: Help with ground points.

    headlight switch not illuminating, dic flickers, window motors/door locks are slow and dim all lights. keyless not working.

    sunroof motor does not like cold. near non-functional, last night, trying to open it kept resetting the rearview mirror since it was bogging down power so bad. I suspect a bad ground as when i first got the car, the domes would stay on when fuse was put back, which turned out to be something loose in the switch panel for the sunroof.

    p/o has run a wire from i/p drl fuse to brwn turn signal wire. I'd like to remove this, and troubleshoot it back to factory. looking at wiring diagrams, this looks like a pretty major circuit. Ties into s204 brwn.

    Between here & reddit, redoing grounds has been suggested, don't want to miss any. freshening up the underhood grounds seemed to help smooth out running and brighten headlights.
    Black 2001 GTP Sedan
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  4. #4
    Killa Bee Scottydoggs's Avatar
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    Default Re: Help with ground points.

    how are your battery cables? alternators power level at idle? a weak charging alt or dead battery can really make things act up.

    if you see any bare copper wire at the ends of the cables, replace them.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, 2.8, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW

  5. #5
    SE Level Member ELECTRICxWIZARDx's Avatar
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    Default Re: Help with ground points.

    batt cables in good shape. re-cleaned terminals with crc batt cleaner just in case.

    with digi multimeter, here's what i'm reading right now.

    ign off: 12.27v at batt.[few days ago, hooked up to charger, 12A setting for ~3h. maybe not holding charge well?]
    start engine, idle:14.5v
    idle w/ headlights, fogs, a/c all on:14.3v
    ign off, after ~5min idle: 12.75

    all readings also checked using alt cable as batt +, and body ground near batt tray as batt -. no appreciable difference.
    Black 2001 GTP Sedan
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  6. #6
    Killa Bee Scottydoggs's Avatar
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    Default Re: Help with ground points.

    you gots a gremlin or two. might be a bad bcm, or maybe a just a dirty plug to it.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, 2.8, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW

  7. #7
    SE Level Member ELECTRICxWIZARDx's Avatar
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    Default Re: Help with ground points.

    right. which is why i'm looking for the interior ground points. once faulty grounds can be ruled out, then i'd know the problem lies in the other side of circuits.

    looks like there are 4 in the i/p area, and 2 in the passenger compartment.

    the "ground locations" thread stickied in how-to only has illustrations for the under-hood grounds, g100, g101, etc.
    Black 2001 GTP Sedan
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  8. #8
    GT Level Member Gregorius's Avatar
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    Default Re: Help with ground points.

    There is 1 on each side under the front carpet, into the floorpan, just inside the door sill roughly midway between the seat front and the kick panel. If the car has ever had water in it <on a GP?, no way!!!> that passenger side one might be the culprit.

    Hmm. I'm thinking of an 04+ and this is a 01. Meh I'll leave it here anyway. The bodies are so similar.
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  9. #9
    SE Level Member ELECTRICxWIZARDx's Avatar
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    Default Re: Help with ground points.

    Thanks you! Ok, those should be G301 & G302 on the diagrams...

    How about up in the dash?
    Black 2001 GTP Sedan
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  10. #10
    Donating Users Swiggles's Avatar
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    Default Re: Help with ground points.

    I think thereís one under the steering wheel in the metal panel area. Been awhile since Iíve been down there and I no longer have that car. I think the pass side one is near the fuse box.

    No more GP 04 Impala SS Indy:
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  11. #11
    Rarely Here Anymore HighOctaneRacing's Avatar
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    Default Re: Help with ground points.

    x2.

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