Speedo illumination and tacho illumination

The other gauge illumination is completely out 100% of the time.

Tachometer illumination lights are grounded (earthed) via the tachometer body, specifically the tab at the bottom of the tacho being bolted to the dash frame

Check for ground at the tacho case

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All your dash illumiation lights are not working? There are three illumination bulbs in the dash Cluster Gauge, two for speedo and one in center of fuel/temp gauge


Check the headlight switch



* One of the Green/Blue (GL) wire connects to the GL wire of fuse box ('PT' terminal)

Test with light switch OFF - must have 12V at one of the GL wires. If not, check the ParkTail fuse in the Fuse Box



* The other GL wire feeds the dash harness for "parking" lamp circuit

Test with light switch at 1st pull-out position (park lights). Must be 12V on both GL wires. Ditto for 2nd pull-out position (headlights)

If that tests OK, then pull the round connector off the dash, and check for 12V at the GL wire


If the GL wire here is getting 12V, then the problem is in the Cluster Gauge. Check for burned-out bulbs, bad ground, broken/burned circuit trace, or corroded lamp connections


NOTE: There are only three illumination bulbs in the dash Cluster Gauge, two for speedo and one in center of fuel/temp gauge

Here's how to check for: Dash Light problems

Thanks DD.

Here is a photo before installation.

Both gauges are grounded. Hopefully its just a blown bulb.

Brake Switch wires should be both GY

In this photo one looks GL? Which would cause the dash lamps light when you step on the brake pedal

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Thanks i will check this out asap. It did this even before i took the dash out. Could be a mistake by previous owner

What should the GL wire connect to instead?

Currently on car:

GY and GW to brake switch. Does it matter what order?

GW and GL to hazard flasher

GL wires are illumination



GW + GL wires is Hazard flasher

GY wires are brake/stop -- that's a problem if your switch is wired to a GW

So T/S flasher unit: G + W
* L terminal: White
* B terminal: Green

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