Diff lock instrument warning light

eidographer · Jul 26, 2018

Can anyone tell me what the difference between these two warning lights is? My assumption is that the one on the left is the actual diff lock indicator but I'm not sure. A comprehensive Google search turns up tons of pics that show only the one light (the one on the right), not both. I have a 1991 D90 LHD.

Thanks in advance,

Bruce

Red90 · Jul 26, 2018

Right is diff lock, left is six wheel drive, which is really strange to see in a 90...

eidographer · Jul 26, 2018

6 wheel drive? Thats a new one on me. Can you explain? Also that light is coming on incessantly - what does the warning light indicate?

Many thanks.

Red90 · Jul 26, 2018

Since you do not have a 6x6, then it is hooked to something else. Someone has put that in there. It is not original. You will need to trace the wiring on your own.

Red90 · Jul 26, 2018

That location on a normal truck is a park brake indicator. You might look there.

eidographer · Jul 26, 2018

Thanks John, I start there.

300tdi convert · Jul 26, 2018

Also, the light below the diff lock should be a coil symbol on the TDi for the glow plugs which is fine as long you know what it is. I'd stick with the 6x6 panel as a novelty. Pretty cool.

Red90 · Jul 27, 2018

Nope. The 200tdi era used the choke symbol for the glow plugs.

eidographer · Jul 27, 2018

Whoa! This just blew my mind. I had assumed the 200 TDI uses a relay and not the key-turn to heat the chambers - I guess mostly since the instrument panel didn't have a glow plug warning light. I have never turned the key and waited before starting the truck - even in them middle of the High Sierras in winter. What does this mean? My head is now seriously kettled.

6777 · Jul 27, 2018

A true 200tdi spec truck does have timer/relay . A swapped early truck will not have this feature and you need to hold the key in the half position, as designed for the 2.5td and 2.5na engines.

You can easily add a timer and wiring so you don't have to hold it

Vedrover · Jul 27, 2018

Did your Landy or instrument panel come from Australia? That'd be the only place where you can come across a 6x6 instrument cluster.

Here's an example of another vehicle in Australia with the same lights cluster:

Interestingly enough, it's advertised as 6x6 but only has 2 axles.

Jonesy · Jul 27, 2018

Vedrover said:
Did your Landy or instrument panel come from Australia? That'd be the only place where you can come across a 6x6 instrument cluster.

Doubtful the truck did - it is LHD.....but you are right about the cluster....prob sourced there.

Jonesy · Jul 27, 2018

Also - of note is the 24V light - me thinks ex-military for snizzle....

eidographer · Aug 5, 2018

Thanks guys. The truck was sourced from Italy. Its a weird one this. No idea how that instrument panel made its way into the vehicle. As far as the warning light is concerned I worked under assumption that this light is the PARK BRAKE and checked the brake fluid and reservoir sensor. All good on those two fronts. There is no hand brake sensor switch installed on the truck, so now I am at a loss as tom why the warning light is illuminating. Its driving me bonkers!

Red90 · Aug 5, 2018

You will need to pull the cluster and trace the wire. It is easy to pull.

Diff lock instrument warning light

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