Cockpit wiring, Lighting & Electrical Test

Ignition & Column Wiring

I paid GBS to modifying my Column stalks to work with their own loom. This simply plugged in. The only job for me here was to prepare the ignition wiring and adapt it to the GBS connector. Simple enough I hoped.

I located the ignition wiring connector on my old Mazda loom and looked up the functions of each wire. Mine is a Mk2.5 which is slightly different to the Mk2. Looking at the GBS loom schedule I worked out connections.

Mazda 2x White / Red  -> GBS red --- 12v fuse supply

Mazda White -> GBS pink --- Starter solenoid

Mazda Black / White -> GBS Yellow --- auxiliary isolator relay switch

Mazda Blue -> GBS all blacks --- 12v ignition out

Mazda Black / Red -> not used

At first I seemed to have power when the ignition was off. Mysterious. Checked all sources that confirmed my wiring was good. By process of elimination I started with the Mazda Ignition barrel itself which turned out to be the issue. Took it apart, cleaned it up and hey presto I had power!

GBS loom side

Mazda Connector Side

I intend to added a start button but will leave that for another time.

Lower Dash Loom

I thought I would save some hassle by buying the lower dash loom from GBS. At best its a half a job as the wiring for the hazard warning lights is not done, so should not have bothered.

I am going to have switches for hazard, horn, washer and rear fog lights. I found these double pole illuminated aluminium savage switches on carbuilder.com which looked nice.

I will also add a USB socket, haven't made up my mind about a 12v socket.

On the positive side I found a wiring diagram for all my switches on technical downloads section of the GBS website.

I scavenged the additional wiring from old Mazda loom I have kept and bought some better sized spade connectors than were provided with the lower dash loom. I got some Zener diodes and soldered them in. Got the diodes the wrong way around to begin with but a quick switch and all was working as intended. 

Lighting

I bought the lighting kit from GBS which included halogen headlights, LED front indicators, rear fog, reverse & rear light clusters which include brakes and indicators. Should be plug and play.

Testing

With most of the wiring complete I've kept a list