1988 Perentie reversing and indicator lights not working

[TimK]

Hi Everyone
I have a 1988 GS Perentie and my reversing and indicator lights have stopped working. They work off a common fuse so that was my first item to check. The fuse is good and there's definitely 12 volts getting to the fuse. As far as I can see the only thing these two systems share is the fuse, so I'm a bit confused why they would both stop working if the fuse is ok.
Has anyone got any advice?
Cheers
Tim K

[Tins]

Hi Everyone
I have a 1988 GS Perentie and my reversing and indicator lights have stopped working. They work off a common fuse so that was my first item to check. The fuse is good and there's definitely 12 volts getting to the fuse. As far as I can see the only thing these two systems share is the fuse, so I'm a bit confused why they would both stop working if the fuse is ok.
Has anyone got any advice?
Cheers
Tim K

Slightly left field, but check any trailer plug wiring.

Even more left field, as Perenties are after my time, but does it have a Blackout switch? Used to have issues with those on IIAs

[p38arover]

Perenties do have a blackout switch, left hand side. Knob 28.

Screenshot 2024-05-19 at 16-18-11 PUBR001 - 4x4 Perentie Combined V1.01.pdf.jpg

A problem with the reversing light alone could be due to a faulty oil pressure switch. I'm fairly sure that the engine has to be running for the reverse lights to work.

Ahh, here we are:

Screenshot 2024-05-19 at 16-27-09 VEH G103 ISS 2_1_of_3.pdf.png

Note the gearbox reverse switch in series with the engine switch.

However, as previously stated reversing and indicators have a common fuse, fuse 11, a 15A item. Did you check for voltage on both sides of the fuse with a digital voltmeter or a test lamp? DVMs have a very high input impedance, usually 10Mohm/volt and can give a "good" reading with just leakage current across a circuit as they don't load the circuit. I prefer my old analogue meters when chasing odd faults as they have a lower input impedance, e.g., 1000 ohms/volt or 20,000 ohms per volt.

[TimK]

Thanks for the advice both.

It turned out to be two totally separate issues that happened simultaneously, this combined with them coming from the same fuse had me confused for a while.
It turns out that the indicator issue was a dead indicator relay and the reversing lights was a dodgy connection associated fitting a 7 pin trailer plug.
All sorted now!

Cheers

Tim K