4.6 Ignition outputs 4 WIRING
Pin number Function
1 12 volt power
2 Ground to cylinder head
3 Spark out from MS3Pro
4 Ground to cylinder head
4.6.5 MSD and other single channel capacitive discharge ignitions
Capacitive discharge boxes are a popular choice to deliver a strong spark when running a distributorless ignition
is not an option. Many of these are intended for an unusually high current signal instead of a logic level output. To
use one of these boxes, connect the Tach Out wire on the MS3Pro to the ignition box’s points trigger. The MSD 6A
box used a white wire for this input, and most other CDI boxes have followed their lead.
4.6.6 Common firing orders
AMP EFI MS3ProUltimate manual version 1.203, firmware 1.5.0, 5/23/2017 Page 49
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