MSD 8732 Installation

Page 1

Digital 2-Step

PN 8732

For the Digital 6AL Ignition Control, PN 6425

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Parts Included:

1 – Control 4 – Mounting Screws

WARNING: During installation, disconnect the battery cables. When disconnecting the battery, always remove the negative cable ﬁrst and install it last.

Note: Must be used with an MSD Digital 6AL Ignition, PN 6425.

OPERATION

The Digital 2-Step Control is designed specifically for the MSD Digital 6AL

SWITCHED

12V

BLACK

TO GROUND

Ignition Control, PN 6425. It provides the ability to set an rpm limit to be used during the launch of the vehicle through a switch or tied into a line-lock device or trans-brake.

There is a Blue wire coming out of the 2-Step, that controls when the launch rpm limit is activated. When this wire is connected to 12 volts, the 2-Step is activated. When released, the rpm limit that is set in the Digital 6AL Ignition is active. This wire can be tied into a trans-

RED

BLUE

ACTIVATE THE

2-STEP WITH

12 VOLTS

GRAY

TACH WIRE

ON MSD 6AL

PN 6425

X1000 X100

ALWAYS SET THE RPM VALUE

WITH THE PRINTED NUMBER ON

THE HOUSING. THIS FIGURE

SHOWS A SETTING OF 3000 RPM.

brake circuit, a clutch switch or simply a stand alone switch.

Figure 1

RPM LIMIT

The rpm limit is set with the two rotary dials, in 100 rpm increments. The limit can be programmed from 2,000 rpm to 11,800 rpm. (The position for 11,900 is reserved for use with MSD's Power Grid ignition system.)

LED

There is a useful LED built into the Digital 2-Step. This LED will illuminate when 12 volts are applied to the Blue wire and the low rpm limit of the 2-Step is active. When 12 volts are removed from the Blue wire the 2-Step rev limit and the LED will turn off.

3-STEP

If you prefer to have three different rev limits, a second PN 8732 could be used to provide a third rev limit, such as for use during the burnout.

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Page 2

2 INSTALLATION INSTRUCTIONS

MOUNTING

It is suggested to mount the unit within easy reach for adjustments. The Control can be mounted under the hood but should be away from direct engine heat sources. Make sure the wiring reaches the connections and mark the mounting holes. Use an 1/8” bit to drill mounting holes and mount the unit.

WIRING

Red Power. Connect to a switched 12 volts.

Black Ground. Connect to ground.

Blue Launch RPM Activation wire. When connected to 12 volts the launch rpm value is active. Gray Tach Signal. Connect to the Gray Tach Output wire of the MSD PN 6425.

12 VOLTS IGNITION KEY

DISTRIBUTOR

POINTS/AMPLIFIER

MAGNETIC PICKUP

MICRO SWITCH

PN 8820

SWITCH OR

ORANGE

BLACK

WHITE

RED

VIOLET

TO 12V

GREEN

BLUE

GRAY

REV

LIMITER

GRAY

RED

12 VOLTS

DIGITAL 6AL

BLACK

X1000

TO GROUND

TACH OUTPUT

X100

TO LINE LOCK

OR TRANS-BRAKE

SOLENOID

Figure 2 Wiring the Control with an MSD Digital 6AL Ignition Control.

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Page 3

INSTALLATION INSTRUCTIONS 3

TO MSD

DIGITAL 6AL

GROUND

87A

CLUTCH SWITCH

(+) 12V

IF YOUR APPLICATION REQUIRES USING THE CLUTCH FOR EVERY SHIFT, THIS DIAGRAM WILL PROVIDE A REV LIMIT ON THE LAUNCH ONLY AND HOLD THE LINE LOCK ON UNTIL THE CLUTCH PEDAL IS RELEASED.

RELAY

PN 8961

GRAY

JUMPER

GRAY

BLUE

12 VOLTS

RED

BLACK

GROUND

TACH OUTPUT

X1000 X100

TO 12 VOLTS

MOMENTARY

PUSH BUTTON

SWITCH

LINE LOCK SOLENOID

GROUND

Figure 3 Wiring the Digital 2-Step to a Latching Relay.

WIRE TAP INSTALLATION

1. Insert male end cup into wire to be spliced.

3. Hand tighten barrel into male end cup.

3. Strip wire approximately 3/8” (10mm).

4. Insert wire into male end exposing only bare wire.

5. Hand tighten male end to barrel.

MALE

END

BARREL

3/8”

(10mm)

WIRE TO BE

SPLICED

MALE

END CUP

Figure 4 Wire Tap.

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Page 4

4 INSTALLATION INSTRUCTIONS

TECH NOTES

_________________________________________________________________________________________________________________________

Service

In case of malfunction, this MSD component will be repaired free of charge according to the terms of the warranty.

When returning MSD components for warranty service, Proof of Purchase must be supplied for veriﬁcation. After the warranty period has expired, repair service is based on a minimum and maximum fee.

All returns must have a Return Material Authorization (RMA) number issued to them before

being returned. To obtain an RMA number please contact MSD Customer Service at 1 (888) MSD-7859 or visit our website at www.msdignition.com/rma to automatically obtain a number and shipping information.

When returning the unit for repair, leave all wires at the length in which you have them installed. Be sure to include a detailed account of any problems experienced, and what components and accessories are installed on the vehicle. The repaired unit will be returned as soon as possible using Ground shipping methods (ground shipping is covered by warranty). For more information, call MSD Ignition at (915) 855-7123. MSD technicians are available from 7:00 a.m. to 5:00 p.m. Monday - Friday (mountain time).

Limited Warranty

SD IGNITION warrants this product to be free from defects in material and workmanship under its intended normal use*, when properly installed and purchased from an authorized MSD dealer, for a period of one year from the date of the original purchase. This warranty is void for any products purchased through auction websites. If found to be defective as mentioned above, it will be repaired or replaced at the option of MSD Ignition. Any item that is covered under this warranty will be returned free of charge using Ground shipping methods. This shall constitute the sole remedy of the purchaser and the sole liability of MSD Ignition. To the extent permitted by law, the foregoing is exclusive and in lieu of all other warranties or representation whether expressed or implied, including any implied warranty of merchantability or ﬁtness. In no event shall MSD Ignition or its suppliers be liable for special or consequential damages. *Intended normal use means that this item is being used as was originally intended and for the original application as sold by MSD Ignition. Any modiﬁcations to this item or if it is used on an application other than what MSD Ignition markets the product, the warranty will be void. It is the sole responsibility of the customer to determine that this item will work for the application they are intending. MSD Ignition will accept no liability for custom applications.

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FRM30243 Revised 01/11 Printed in U.S.A.

MSD 8732 Installation

Specifications and Main Features

Frequently Asked Questions

User Manual