What fuse powers the ignition coil in this diagram?

Fuse #7 feeds the ignition coil, via a BLK-WHT wire and also via an NCA wire to another coil terminal.

What wire colors are used in the tach/ignition circuit shown?

BRN (brown) from the tach/instrument cluster, BRN-WHT (brown-white) between the filter, distributor, and ignition coil, BLK-WHT (black-white) from Fuse #7, and an NCA wire to the ignition coil.

Which ECM pin receives the tach/ignition signal?

ECM Pin #2 connects to the BRN wire in the tach circuit.

Is there a filter in the tachometer circuit?

Yes, the BRN tach wire passes through a filter shown as a resistor with a capacitor to ground before joining the BRN-WHT wire to the ignition coil/distributor.

How many distributor cap terminals are shown and which way does the rotor turn?

The distributor cap is shown with four numbered terminals (1-4) and an arrow indicating counterclockwise rotation.

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Ignition Coil, Distributor & Tach Signal Wiring Diagram - Fuse #7 Circuit

Ignition wiring diagram for distributor, ignition coil, filter and tachometer circuit

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Wiring diagram showing distributor, ignition coil, noise filter, tachometer and ECM ignition connections.

AI caption January 2011 · Photo 57 of 676

This document is a wiring diagram of an ignition/tachometer circuit showing how the tachometer signal is routed from the ignition system to the instrument cluster. A BRN (brown) wire runs from the TACH (instrument cluster) through a noise filter (dashed box containing a resistor and a grounded capacitor) and also feeds ECM PIN #2. A BRN-WHT (brown-white) wire connects the filter circuit to the ignition coil and distributor. Power is supplied through FUSE #7 on BLK-WHT (black-white) and via an NCA wire to the ignition coil, which also has a condenser (COND) to ground. The distributor cap is drawn with four terminals numbered 1 through 4 and an arrow indicating counterclockwise rotor rotation, with the distributor body grounded. From this diagram a reader can learn the wire colors (BRN, BRN-WHT, BLK-WHT, NCA), the fuse feeding the ignition coil (Fuse #7), the tach signal path including the RFI filter, and the ECM pin (Pin #2) that receives the ignition reference/tach signal. No year, make, model, or part numbers are stated on the visible portion; the bottom caption is cut off.

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Frequently asked questions

What fuse powers the ignition coil in this diagram?: Fuse #7 feeds the ignition coil, via a BLK-WHT wire and also via an NCA wire to another coil terminal.
What wire colors are used in the tach/ignition circuit shown?: BRN (brown) from the tach/instrument cluster, BRN-WHT (brown-white) between the filter, distributor, and ignition coil, BLK-WHT (black-white) from Fuse #7, and an NCA wire to the ignition coil.
Which ECM pin receives the tach/ignition signal?: ECM Pin #2 connects to the BRN wire in the tach circuit.
Is there a filter in the tachometer circuit?: Yes, the BRN tach wire passes through a filter shown as a resistor with a capacitor to ground before joining the BRN-WHT wire to the ignition coil/distributor.
How many distributor cap terminals are shown and which way does the rotor turn?: The distributor cap is shown with four numbered terminals (1-4) and an arrow indicating counterclockwise rotation.