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Electrical Confirmation on MSD bypass

  • Thread starter Thread starter Marlena6593
  • Start date Start date Mar 12, 2022
M

Marlena6593

New Member
Feb 1, 2022
2
0
1
San Francisco
Mar 12, 2022
#1
  • Mar 12, 2022
  • #1
Hello! I'm running into an issue where the engine will stumble at 3k rpm, almost as if the rev limiter is being activated. So, I'm looking to bypass the MSD 6AL box on the car to identify if the ignition box is the issue.

My understanding is that the small red wire (ignition switch) connects to the positive side of the MSD Blaster 3 coil, and the white (electronic ignition amplifier) and gray (tach) wires attach to the negative side of the coil. Can anyone confirm that this is correct? If not, what is the correct wiring to bypass the MSD box?
 

96pushrod

I think they're a little easier to get off
5 Year Member
May 15, 2018
1,530
871
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Savannah
Mar 13, 2022
#2
  • Mar 13, 2022
  • #2
Is the car setup with the tfi style distributor still?
 
M

Marlena6593

New Member
Feb 1, 2022
2
0
1
San Francisco
Mar 13, 2022
#3
  • Mar 13, 2022
  • #3
@96pushrod - Yep, it is TFI. And I'm using the stock 5.0 efi system
 

General karthief

wonder how much it would cost to ship you a pair
5 Year Member
Aug 25, 2016
27,845
10,521
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polk county florida
Mar 13, 2022
#4
  • Mar 13, 2022
  • #4
My opinion is if the car has the stock computer and ignition system get rid of the MSD and the blaster coil.
JMO based on questions here when using the aftermarket add on ignition boxes and aftermarket coils, more often than not they don't play well, those aftermarket coils are not as good as the original Ford coils.
Again my opinion.
 

mikestang63

SN Certified Technician
Aug 27, 2012
11,606
8,859
214
In the garage
Mar 14, 2022
#5
  • Mar 14, 2022
  • #5
what is the gap on your plugs. Stock is around .55 thousands. On a stockish motor, the MSD box and coil do nothing IMO and are prone to failing. The stock coil and ignition is more than capable of 500 hp. You can easily bypass the MSD box by removing the jumper wires and going straight to the coil. If you have a a stock coil, I would throw that back on as well.
 
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