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Main Grounds (Engine Chassis)

This category on the website [ Starting Charging Ignition Wiring & Connectors ] we are giving you all of the information related to the individual parts in the Buick Turbo Regal, along with the associated wiring, connector plugs, etc.

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VEHICLE APPLICATION:

Buick Regal, T-Type, Turbo T, Limited, Grand National, GNX

PART NAME:

Engine Grounds

PURPOSE OF PART:

this set of wires grounds all of the components for the engine (sensors, relays, etc)

TURNS ON-OFF / FUNCTIONS / USED WHEN:

in constant use

LOCATION IN VEHICLE:

back of passenger head on engine
driver side top transmission bolt.

ORIGINAL GM PART NUMBER:

PART BASE COLOR:

black

CONNECTOR PLUG COLOR (PART SIDE):

ring terminal

WIRES ATTACHED (PART SIDE):

black, black/white, tan

CONNECTOR PLUG COLOR (HARNESS SIDE):

ring terminal

NUMBER OF WIRES ATTACHED (HARNESS SIDE):

4

COLOR & PURPOSE OF (HARNESS SIDE) WIRES:

There are four ring type terminals at the elbow of the main wiring harness, two of which attach to the rear of the passenger side cylinder head and two that attach to one of the transmission bellhousing bolts.

Ring terminal with 2 black/white 16 ga wires (short length)- A/C head pressure switch (gray), MAF, EGR (EVRV) Fuel pump relay, Coolant fan delay relay, ECM large connector C&D ground
(NOTE: all spices are within 4 inches of ring terminal)

Ring terminal with 2 black/white 16 ga wires (long)- ECM large connect aux ground, ESC module ground
(NOTE: all spices are within 12 inches from the large ground grommet going into passenger side firewall below heater box)

Ring terminal with single black 12 ga (short)- A/C high pressure limit switch (round sealed connector at compressor)
(NOTE: the splice connecting these wires is located about 18 inches from coolant fan connector)

Ring terminal with one black/white wire and one tan 16 ga (long length) ECM small connector- A&B ground. ECM large connector C&D- O2 sensor reference ground and there are NO splices on these connections; All are direct.

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PHOTOS OF PART AND CONNECTED WIRES:
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OTHER NOTES:

There’s a ground strap that runs from the blower motor assembly to the dash ground.

There’s a ground strap that runs from the firewall to engine/transmission (top bolt of trans on drivers side).

The negative battery cable also supplies 2 grounds (big cable to engine block on passenger side, pigtail to fender).

[SEE battery cables]

We also ran several additional grounds (some redundant) on our Buick GN, as these cars don’t have the best grounding points/sources.
(the more ground wires, the better. They certainly won’t hurt anything, and may help some issues)
A 10 gauge wire from the alternator bracket to the frame (on driver side), and then another from there over to the driver side fender.
A 10 gauge wire from the coil pack bracket to firewall.
A 10 gauge wire from the middle of the trunk shelf (we drilled a new hole) to the rear passenger side bumper bolt (this helps with stereo/amp issues).
A 10 gauge wire from the frame (rear passenger side bumper bolt) to gas tank strap bolt.

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Here’s a list of all of the ECM Wiring Harness Starting Charging Ignition Wiring & Connectors in the Buick Regal:
(click the links to go to the one you need info about)

* ALDL
* Alternator
* Battery Cables (Positive & Negative)
* Bulkhead Connections & Distribution Blocks
* Coil Pack
* ECM Memory Power Wire
* ECM
* Fuel Pump Test Tap
* Fuse Box
* Fusible Links
* Harness Routing
* Ignition Module (IM)
* Inline Fuses
* Main Grounds (Grounding Points)
* SES Light
* Starter
* Tach Tap Harness
* Volts Light
* Wiring Harness (Main Harnesses in car)

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