installation of the msd 6 series ignition box on the 1993 ford probe gt
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Installation of the MSD 6 Installation of the MSD 6 series Ignition Box on the series Ignition Box on the
1993 Ford Probe GT1993 Ford Probe GT
V0.2 BetaV0.2 BetaApril 22, 2000April 22, 2000By: Mike Paszti (paszti@home.com)By: Mike Paszti (paszti@home.com)Photography: George GebaraPhotography: George Gebara
Contents• External coil tower (the screw)• Transistor hook-up, and MSD box hook-up• Schematic• Miscellaneous notes
What You Will Need• MSD 6A series ignition box• MSD or other suitable external ignition coil• 3055 NPN transistor• 1k resistor (1/4W or greater)
External Coil TowerExternal Coil Tower
The external coil tower is a screw that is screwed into the distributor cap so as to allow the high voltage outputof an external coil to enter the distributor in order to bedistributed to the cylinders.
The screw is driven through the cap so that it contacts themetal strip embedded in the plastic. This strip is common with(i.e., electrically connected to) the rotor inside the cap.
Epoxy is used to reinforce the screw and provide a securefit for the plug wire boot.
External Coil TowerExternal Coil Tower
External Coil TowerExternal Coil Tower
Metal strip runs internally Metal strip runs internally along dashed linealong dashed line
Screw with shavedScrew with shaved
down headdown head
Epoxy Epoxy reinforcementreinforcement
My own repair (unrelated)My own repair (unrelated)
External Coil TowerExternal Coil Tower
Transistor Hook-upTransistor Hook-up
The transistor used in this project is a TIP3055 NPN transistor.It is readily available at Radio Shack for a few dollars.
The 3055 transistor is what triggers the MSD box to fire a spark.The transistor is triggered by the ECU.
By using the 3055, the internal ignitor module is completely bypassed.
Transistor Hook-upTransistor Hook-up
AA
BB
CC
ffeeaaccbbdd
cut
cut
cut
cut
cut
Ignore this diode. It is not required.Ignore this diode. It is not required.
ff
ee MSD
whi
te w
ire
MSD
whi
te w
ire
B, CB, C
Transistor Hook-upTransistor Hook-up
The following wires are cut at the distributor:- A- B- C- e- f
Connections to these wires are all made on the engine sideof the cut wire (not the distributor side).
Transistor Hook-upTransistor Hook-up
Connect to ‘e’: Connection to ground. The ground wire ‘e’ can be identified by its all black colour.
Connect to ‘B’(note 1k resistor): This is the tachometer signal
- MSD Box white wire- ‘A’: ECU requires this signal to operate
Connect to ‘f’: This is the trigger signal from the ECU. This wire will have a coloured stripe on it.
Connect to
MSD Box Hook-upMSD Box Hook-up
Thick Black Wire: Ground to frame
Thick Red Wire: To battery + or high current fused line
Thin Red Wire: Ignition switch (‘C’)
White Wire: Connect to middle lead on transistor
Orange Wire: To external coil “+”
Thin Black Wire: To external coil ‘-’
MSD 6AMSD 6A
SchematicSchematic
Thick Black Wire: Ground to frame
Thick Red Wire: To battery + or high current fused line
MSD 6AMSD 6A
+ -ExternalExternal
CoilCoilDistributorDistributor
CapCap
‘C’‘f’
1k resistor ‘B’
‘A’
‘e’
3055
Miscellaneous NotesMiscellaneous Notes
• Mazda/Ford made subtle changes to the distributor between model years. In some model years wires ‘A’ and ‘B’ are switched.
• As noted earlier, ‘e’ and ‘f’ are incorrectly identified in the Ford Service Manual. If in doubt, the ground wire ‘e’ can be identified by its all black colour.
• There appears to be some differences between the 1993 Probe GT tachometer electronics and those of the Mazda 626/MX-6. This writer was unsuccessful in making the tachometer work on a 1994 Mazda 626 with a MSD 6A BTM even though the exact same set-up worked on a 1993 Probe GT. The MSD tachometer adapter may resolve this problem.
•As noted earlier, regarding the wires that are cut at the distributor, all connections are made to the “engine” side of the wires.
• The cut connections on the distributor side, particularly ‘A’, ‘B’, and ‘C’, should be electrically insulated to prevent shorting.
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