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  • 1996 - 2004 SN95 Mustang -General/Talk-
  • SN95 4.6L Mustang Tech

Electrical Ground Wire Help Please

  • Thread starter Thread starter rattlecan96gt
  • Start date Start date Dec 29, 2016

rattlecan96gt

Active Member
Dec 22, 2016
106
8
28
Dallas, Texas
Dec 29, 2016
#1
  • Dec 29, 2016
  • #1
what I am trying to figure out is this red wire is connected to that bolt on the rac and it goes to the subframe right by it ...my question is shouldn't it be going from the motor mount to the subframe this may be a stupid question but does it make a difference ?
 

rattlecan96gt

Active Member
Dec 22, 2016
106
8
28
Dallas, Texas
Dec 29, 2016
#2
  • Dec 29, 2016
  • #2
well then
 

wmburns

SN Certified Technician
Aug 14, 2009
5,892
514
204
Houston Texas
Dec 29, 2016
#3
  • Dec 29, 2016
  • #3
There should be one of the bolts that holds the motor mount plate to the block that is a two headed stud. Where the smaller is for the grounding strap ring terminal.

As others have pointed out there's a bolt on the bottom of the left hand frame rail where the other end of the grounding strap goes.

If connected to the steering rack, this couldn't possibly be providing a high current ground needed for the alternator to work correctly.

If you think this might be your problem then try connecting a booster cable from the battery negative to the alternator case and see what happens.

Or measure the voltage between the alternator case and battery negative. Should be very small. The size of the voltage drop indicates the quality of the ground. A large value means a poor ground.
 
S

soupnutz

Member
May 23, 2009
73
0
6
Hampton Roads, VA
Dec 31, 2016
#4
  • Dec 31, 2016
  • #4
I redid all my power and ground wires with 1/0 wiring. On the passenger side I went from the motor mount bolt to the sway bar mount frame bolt. On the driver side I went from the motor mount to the k member bolt to the main ground hookup up by the battery.
 
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