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Chevrolet Tahoe 12V Automotive Battery Replacement Guide
How to change a dead 12 volt car battery in the engine bay of a 2nd generation 2000 to 2006 GM Chevy Tahoe SUV.

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2006 Tahoe 12V Battery
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Loosen 10mm Side Bolt
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Loosen Front 10mm Bolt

This automotive maintenance tutorial was specifically written to assist owners of the second generation (2000, 2001, 2002, 2003, 2004, 2005 & 2006) GM Chevrolet Tahoe SUV in changing a dead 12 volt car battery in the engine bay.

Owners of other General Motors GMT800 series SUV or truck vehicles such as the Chevy Silverado, Suburban, Avalanche, GMC Yukon, Sierra, Hummer H2 and the Cadillac Escalade may also find these DIY instructions to be helpful.

The tools needed to complete this procedure include an 8mm socket, a 10mm socket, a 12mm socket, extension bars, a and a 3/8" drive ratcheting wrench.

The correct "Group Size" battery for the '00 to '06 Tahoe is "78" or "75". Check out compatible batteries at Amazon.com.

A few compatible replacement batteries with their part numbers are as follows: EverStart Plus 75-3N (75-3S) or 78-3, Everstart Maxx MAXX-75N or MAXX-78N, Bosch 78-770B, Optima RedTop RED75/35DT, ProStart 75-650PS or 78-700PS, AutoCraft 75-2 or AutoCraft 78-1 and Bosch S6563B S6.

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10mm Bolt Removed
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Cross Brace Bar Removed
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Loosen Negative Terminal
The first two steps are to open the hood and then move to the right front corner of the engine bay.

Loosen the two 10mm bolts that hold the cross brace bar in place by turning them counterclockwise.

Spin out the bolts and remove the cross brace bar. Set the bar aside in a safe place.

First loosen the negative terminal by turning it counterclockwise with an 8mm wrench.

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8mm Terminal Bolt
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Cover Terminal & Tuck Away
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Loosen Positive Terminal
Pull the negative "-" terminal off the battery post, wrap it in a small towel and tuck it away on the side of the battery to prevent accidental contact.

Then loosen the positive (red) terminal by turning the 8mm bolt in the counterclockwise direction

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"+" Terminal Disconnected
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12mm Socket & Extensions
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Battery Hold Down Clamp
The battery is held in place to the engine bay by a plastic clamp at the rear bottom edge.
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Loosen Counterclockwise
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12mm Bolt Removed
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Battery Clamp Block
Attach a 12mm socket to an extension bar (or two) and the 3/8" drive ratcheting wrench.

Loosen the battery hold down clamp by turning the 12mm bolt in the counterclockwise direction.

Remove the bolt and plastic block. Set them aside in a safe place.



 

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Lift Out Old Battery
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Walmart MAXX-78S
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Clean Off Battery Tray
Carefully lift the old battery straight out of the engine bay.

Try to avoid tipping over or dropping the old battery to prevent from having battery acid leak out.

Clean off any debris from the plastic battery tray so that the new battery will rest evenly on it.

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Lower In New 12V Battery
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Replace Battery Clamp Block
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Tighten 12mm Bolt Clockwise
Gently lower in the new battery with the "-" negative post on the left (passenger) side and the "+" positive post on the right (driver) side of the engine bay.

Line up the bolt hole in the plastic battery clamp block with the hole in the tray.

Spin in the 12mm battery clamp bolt a few turns by hand and then tighten it in the clockwise direction with the socket wrench until it is snug.

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Spin In Positive Terminal
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Tighten 8mm Clockwise
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Tighten Negative Terminal
First replace the positive (red) terminal by spinning in the terminal bolt a few turns by hand in the clockwise direction.

Continue tightening the positive "+" terminal in the clockwise direction with the 8mm wrench until it is snug.

Try to avoid over tightening the terminal bolt to prevent from damaging the battery which can lead to an acid leak.

Then spin in the negative "-" battery terminal bolt and tighten it in the clockwise direction with the 8mm wrench.

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Replace Cross Brace Bar
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Spin In 10mm Bolt
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Front 10mm Bolt
Line up the cross brace bar and spin in the two 10mm bolts a few turns by hand.
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Tighten 10mm Bolt
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Tighten Front Bolt Clockwise
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12V Battery Replaced
Tighten the two bolts in the clockwise direction with the 10mm socket and 1/4" drive ratcheting wrench until they are snug.

Test the new 12V battery by starting the engine and turning on the headlights.

Be sure to adjust the time on the clock and program your favorite radio station presets before driving.

For more, check out my other 2000-2006 GM Chevrolet Tahoe DIY Repair & Maintenance Guides.
 

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