Location of grounds. Low BLM.

[klrv6]

Trying to track down low bml issue (105). Does anybody have a schematic for the location of grounds?

 

[Audie1]

Hope this helps you out.





Turbo Regal Engine Grounds

John Spina


Introduction
There are four ring terminals at the elbow of the wire harness, two of which attach to the rear of the passenger side cylinder head and two which attach to one of the bellhousing bolts. These engine ground points are succeptable to contamination by road salt, grease, etc., and occasionally become loose for some reason. These four ring terminals provide grounds for all of the engine sensors that require direct battery grounds. They also provide a ground feed for the ECM, A/C clutch, and digital dash (if so equipped).
If the ground connection becomes faulty, several problems may arise. It is essential to maintain ground integrity at the grounding points to assure proper operation of the electronics on the engine.
Ground Terminals and Feeds
The following will describe each ring terminal and its associated feed.
1. Ring terminal with two black/white 16 gage wires, short length:
• A/C head pressure switch (gray connector)
• Mass AirFlow sensor ground
• EGR solenoid (EVRV) ground
• Fuel pump relay ground
• Coolant fan delay relay ground
• ECM large connector (C & D) ground
NOTE: The internal splice connecting all these wires together is located about 4 inches from the ground ring terminals, inside the oval conduit.
2. Ring terminal with two black/white 16 gage wires, long length:
• ECM large connector auxillary ground
• C437 connector ground (feeds digital dash)
• ESC module ground
NOTE: The internal splice connecting all these wires together is located about 12 inches from the large round grommet going into the passenger side, below the heater box.
3. Ring terminal with single black 12 gage wire, short length:
• AC high pressure limit switch (round sealed connector at compressor)
• Coolant fan ground
NOTE: The internal splice connecting these wires together is located about 18 inches from the Coolant Fan connector.
4. Ring terminal withone black/white wire and one tan wire, 16 gage, long length:
• ECM small connector (A & B) ground
• ECM large connector (C & D) oxygen sensor reference ground
NOTE: There are no internal splices on these connections; they are direct.
The ring terminal with a single 12 gage black wire, near the Powermaster unit is a ground connection for the Powermaster unit only.

 

[aminga]

Hope this helps you out.





Turbo Regal Engine Grounds

John Spina


Introduction
There are four ring terminals at the elbow of the wire harness, two of which attach to the rear of the passenger side cylinder head and two which attach to one of the bellhousing bolts.

Interesting. I thought ALL 4 were on the head.

 

[A2000RICH]

Interesting. I thought ALL 4 were on the head.

they are all on the rear of the pass. head-------two rings on each of the same holes that are used for accessory mounting on the front of the drivers head------ except for early 86's where two of them were placed on the last intake manifold bolt and two were on the head---------only ground bolt on the trans bell housing is the braided copper wire on the top drivers side bolt-------its important to remember that those bolts are specially plated (silver in color) to eliminate corrosion and are 10mm with 15mm heads-------i have found all sorts of wrong (rusted) bolts used for this due to sloppy engine swaps------i have also found 3/8-16 bolts but the threads fit loose.........RC

 

[berserker6]

very useful info. thanks for posting

 

[Roger]

I bought Caspers ground kit - it makes adding any after market items a breeze & works.