81502 Datasheet, PDF (1/4 Pages) Mallory performance club – MSD 20 Amp Pro Mag Generator

MSD 20 Amp Pro Mag Generator
Chevrolet: PN 81392
Band Clamp Mount:
Clockwise, PN 81502
Counterclockwise, PN 81602
Note: These instructions are for the installation of the 20 Amp Pro Mag Generator and related components
only.
Note: On engines equipped with block mounted starters, a 16 volt battery is recommended.
INSTALLATION
MOUNTING
The Electronic Points Box can be mounted in any position, except upsidedown. It should be kept clear of
direct engine heat sources such as the exhaust. Before mounting the box make sure the wiring harness and
coil wire reach the generator. The Box is supplied with four 1" vibration mounts. Use a 1/4” drill bit with these
mounts. These vibration mounts are available separately as PN 8822.
INSTALLING THE GENERATOR
The MSD Pro Mag cannot be used with the conventional “Buzzbox”
to set the timing prior to running the engine. Position the number one
cylinder to your desired timing. When the generator is positioned at or
near your desired timing, lock down the housing and install the rotor,
cap and spark plug wires. This will give you a good area to start the
engine and check the timing. MSD offers a setup tool, PN 8122, for the
PN 81502 and PN 81602 generators.
Note: The Pro Mag fires when the rotor tip is leading into the distributor
cap terminal (Figure 1).
WIRING
Figure 1 Rotor Tip and Cap Alignment.
The Pro Mag is equipped with matching connectors and plugs directly
into the Electronic Points Box and the Kill Switch. The 4-Pin connects to the Generator and the 2-Pin connects
to the Kill Switch (Figure 3).
When routing the wiring harness make sure the wires are not pulled tight to the point of being stressed. Also,
take care to route them away from direct engine heat sources and sharp edges. If the connectors do not mate
together, check for bent or mislodged terminal pins. Do not force the connectors together!
Note:
To ensure a good ground path from the Electronic Points Box, a ground wire should be routed from
the Points Box to each cylinder head of the engine. Use a #10 ring lug connector with 16 gauge
wire (Figure 2). The wires should be connected between the Electronic Points Box and the retaining
screw.
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