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Thread: Will a Silverado run with battery disconnected?

  1. #1
    Join Date
    Dec 2003
    Posts
    188
    I have a general electrical question. Will an 01 Silverado still run if you disconnect the battery after it's started? I was thinking it wouldn't since the whole electrical circuit wouldn't be complete but I wasn't totally sure.

    Kyle
    2003 Arrival Blue Silverado SS.....I just can't leave $hit alone.

  2. #2
    Join Date
    Jan 2004
    Posts
    117
    yeah that will cut the juice to the computer and it controls the spark plugs/fuel so it will die

  3. #3
    Join Date
    Mar 2003
    Location
    San Marcos Texas
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    4,393
    The charging system should make pleanty of power without the battery so it should run just fine. Just don't let the + terminal touch any ground while it is running.
    2006 Superior Blue Trailblazer SS AWD, Stock as a rock

    Sold: 2002 GMC Sportside Denali front end with a 2002 LS1, FLT level 5, Yank 2600, Trick Turbo, T76, Nelson intercooler, 60LB injectors, Warbro fuel pump, Eaton locker, Magnaflow, 3.42, Nelson Performance Tuning (speed density).

    Sold: 1981 GMC LB RC 1500 2002 4.8L 4L60E 12 bolt 3.73 Richmond Lock Right AC PS Nelson Performance tuning

  4. #4
    Join Date
    Mar 2005
    Location
    Eagle Pass
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    111
    wouldn't that full field the alternator or whatever , blow up some light bulbs, and break some shit?

  5. #5
    Join Date
    Mar 2003
    Location
    San Marcos Texas
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    4,393
    The alternator is regulated so it will maintain proper voltage. The only way I know of to full field the alternator is to bypass the regulator.
    2006 Superior Blue Trailblazer SS AWD, Stock as a rock

    Sold: 2002 GMC Sportside Denali front end with a 2002 LS1, FLT level 5, Yank 2600, Trick Turbo, T76, Nelson intercooler, 60LB injectors, Warbro fuel pump, Eaton locker, Magnaflow, 3.42, Nelson Performance Tuning (speed density).

    Sold: 1981 GMC LB RC 1500 2002 4.8L 4L60E 12 bolt 3.73 Richmond Lock Right AC PS Nelson Performance tuning

  6. #6
    Join Date
    Jun 2005
    Location
    Round Rock
    Posts
    1,517
    The battery is the source of power to start the vehicle. Once the engine is running the alternator is the source and also charges the battery if it is lower than the power being created by the alternator. As long as the alternator is stable and provides enough juice you can remove the battery. Just don't expect it to start again without the battery...

  7. #7
    Join Date
    Oct 2004
    Posts
    259
    Jethro # 3 and the rest of the guys are right. It should theoredacally speaking stay running.
    Had a 91 SB, Open diff, 3.08 gears, stock LS1/T56. 14.8@95.9...sold.
    Now, 90 C1500 350tbi/NV3500....just bought a 5.3...need T56, Swap parts.....

  8. #8
    Join Date
    Jan 2004
    Posts
    117
    good point...didnt think of the alternator because mine isnt hooked up right now

  9. #9
    Join Date
    Dec 2003
    Posts
    188
    It won't run. My brother's truck kept dying on him at random and it ended up being a partially coroded positive battery terminal connector. Replaced that at the stealership and no more problems.
    2003 Arrival Blue Silverado SS.....I just can't leave $hit alone.

  10. #10
    Join Date
    Dec 2005
    Posts
    4
    It'll run, but if you load the electrical system such as lights and AC, it may die at random because the battery is the cushion. I have also burned up some newer alternators because of turing on electical loads without the battery connected. This was a 94 nissan sentra and a 06 F150. The voltage will spike and can potentially damage the electrical system.
    02 250 7.3 PSD Auto LB EXT CAB XLT - Stock - For Now
    87 Mustang LX 351W 11.50's @ 119 MPH - Toy/Lawn Ornament
    05 Honda Pilot LX Grocery Getter with Dark Tint

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