Finally fed up... - 2003-04 Mach 1 Registry Owners Club

mach1metalhead · 07-17-2016, 08:58 AM

I haven't been able to drive the Mach reliably for some time now, and I miss it. My daily is fine, but boring in comparison.

This leads to my question... I am having issues somewhere in the electrical system of the vehicle and typically the simplest fix is checking the body grounds. That said, save for a couple, I don't know where they are. Does anyone have a diagram or at least a description of the body ground locations? I plan on removing them, cleaning the area, replacing the ring, reinstalling, and then rustproof painting over them.

311-420 · 07-17-2016, 10:38 AM

If it's blowing the big 30 amp fuse to the PCM in the fuse box by the battery ( I believe it's number 25 or 26), then check the noise suppressors at the back of each cylinder head. The one on my passenger side had came unplugged and every time I tried to start the car it would blow that fuse. I just pushed on the connector and it clicked back into place and it hasn't done it since. * knock on wood * Doing a search here, I found one other guy who this happened to, except his was on the driver side. Such a weird thing to just happen...

I couldn't even get mine to start for atleast a month. So I know the frustration you're feeling.

DSG2003Mach1 · 07-17-2016, 11:05 AM

Maybe I've missed other posts but what exactly is it doing?

mach1metalhead · 07-17-2016, 11:28 AM

My issue is that when driving, the gauges will randomly cut out and, while I can't remember the code populated, all signs pointed to ground issues.

DSG2003Mach1 · 07-17-2016, 01:37 PM

I have no idea how many grounds there are in the system but I know a few

1) driver side engine block to frame, attaches at the motor mount and goes up to the frame rail near the sway bar mount I do believe.

2) there are 2 grounds on the radiator support next to the battery

3) Im pretty sure there is a ground point behind the pass kick panel by the pcm/ecu

I cant remember if theres a ground to the engine block over by the starter or not. Id have to imagine theres more but thats all I know of right off hand. Outside of the engine block stuff grounding bolts are typically identified because theyve been coated a green color

07-17-2016, 08:58 AM	#1
mach1metalhead Registered User Join Date: Oct 2007 Location: Orlando, FL Posts: 1,065	Finally fed up... I haven't been able to drive the Mach reliably for some time now, and I miss it. My daily is fine, but boring in comparison. This leads to my question... I am having issues somewhere in the electrical system of the vehicle and typically the simplest fix is checking the body grounds. That said, save for a couple, I don't know where they are. Does anyone have a diagram or at least a description of the body ground locations? I plan on removing them, cleaning the area, replacing the ring, reinstalling, and then rustproof painting over them. __________________ 03 Mach (Auto) JLT RAI - 1/2" Intake Spacer - Mac longtubes - Mac Prochamber - Borla cat-back - PA Racing k-member - Energy Suspension motor mounts - Eibach Sportline springs - Eibach anti-roll kit - SPC caster/camber kit - Steeda X2 ball-joints - Steeda strut tower bar - Eibach 1" wheel spacers (rear only)

07-17-2016, 10:38 AM	#2
311-420 Can't be bridled Join Date: Sep 2007 Location: Texas Posts: 7,006	Re: Finally fed up... If it's blowing the big 30 amp fuse to the PCM in the fuse box by the battery ( I believe it's number 25 or 26), then check the noise suppressors at the back of each cylinder head. The one on my passenger side had came unplugged and every time I tried to start the car it would blow that fuse. I just pushed on the connector and it clicked back into place and it hasn't done it since. * knock on wood * Doing a search here, I found one other guy who this happened to, except his was on the driver side. Such a weird thing to just happen... I couldn't even get mine to start for atleast a month. So I know the frustration you're feeling. __________________ 2004 Mach 1 #6956 5spd w/IUP Eaton swap, longtubes, built 3.73 SRA 452hp/409tq dynojet🏁

07-17-2016, 11:05 AM	#3
DSG2003Mach1 700 HP Mach Join Date: Nov 2003 Location: Orlando, FL Posts: 8,384	Re: Finally fed up... Maybe I've missed other posts but what exactly is it doing? __________________ 03 dsg mach1 - MPR built 9.5:1 motor, D1, cams, ported intake, full exhaust, magnum t56, built rear, E85 etc... '12 F150 FX2 Supercrew with Ecoboost daily beater

07-17-2016, 11:28 AM	#4
mach1metalhead Registered User Join Date: Oct 2007 Location: Orlando, FL Posts: 1,065	My issue is that when driving, the gauges will randomly cut out and, while I can't remember the code populated, all signs pointed to ground issues. __________________ 03 Mach (Auto) JLT RAI - 1/2" Intake Spacer - Mac longtubes - Mac Prochamber - Borla cat-back - PA Racing k-member - Energy Suspension motor mounts - Eibach Sportline springs - Eibach anti-roll kit - SPC caster/camber kit - Steeda X2 ball-joints - Steeda strut tower bar - Eibach 1" wheel spacers (rear only)

07-17-2016, 01:37 PM	#5
DSG2003Mach1 700 HP Mach Join Date: Nov 2003 Location: Orlando, FL Posts: 8,384	Re: Finally fed up... I have no idea how many grounds there are in the system but I know a few 1) driver side engine block to frame, attaches at the motor mount and goes up to the frame rail near the sway bar mount I do believe. 2) there are 2 grounds on the radiator support next to the battery 3) Im pretty sure there is a ground point behind the pass kick panel by the pcm/ecu I cant remember if theres a ground to the engine block over by the starter or not. Id have to imagine theres more but thats all I know of right off hand. Outside of the engine block stuff grounding bolts are typically identified because theyve been coated a green color __________________ 03 dsg mach1 - MPR built 9.5:1 motor, D1, cams, ported intake, full exhaust, magnum t56, built rear, E85 etc... '12 F150 FX2 Supercrew with Ecoboost daily beater

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