4.6 Ignition outputs 4 WIRING
Connection letter Function
A Power ground - connect to engine block or cylinder head
B ECU ground - connect to sensor return
C Spark out from MS3Pro
D 12 volt power
4.6.4 VW pencil coils
VW four pin pencil coils appeared on the VW / Audi 1.8 Turbo from 2001 and later, and many other VW-Audi Group
products. These can be driven directly from the MS3Pro.
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.
AMP EFI MS3Pro manual version 1.202, firmware 1.5.0, 4/21/2017 Page 44
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