Venom Headlight for Westfield MX-5 SDV

Here's the circuit we're building.

The headlight switch and the passing switch both turn on the headlight. The dimmer switch and the passing switch both flip to the high beam.

To make this work we modify the Mazda wiring in two places. One is on the car side of the connector to the steering column. The other is in the instrument cluster circuit board.

Steering column connector, before:

Steering column connector, after:

Notes:

• "R/B" is a red wire with a black stripe, "L/Y" is a blue wire with a yellow stripe, etc.
• Some of the wire colors are different on the steering column side of this connector.
• Check the other end of each wire. (If I remember correctly there are two blue/yellow wires here and only one goes to the right place.)

At each headlight:

On the instrument cluster, the ground side of the high beam indicator lamp needs to be disconnected from ground (by cutting the trace on the board) and reconnected at "beam indicator output" on the steering column diagram. If you do not make this change, the high beam indictor will turn on whenever the headlights are on, high or low.

<image forthcoming>

Greg Parker
gparker-www@sealiesoftware.com
Sealie Software