Defender Td5 difflock light

Defender Td5 difflock light

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Discussion

anonymous-user

Original Poster:

61 months

Monday 7th February 2022
quotequote all
Thought I’d ask despite PH not being too tech-heavy but anyway….
Def 90 Td5, difflock warning light has gone AWOL.
It isn’t the switch and the light still won’t come on if I short the lead directly to earth.
So I’m suspecting a broken wire somewhere.
Is there a common, known spot where they fail, or am I better off just running a new wire?

camel_landy

5,085 posts

190 months

Monday 7th February 2022
quotequote all
Could it be the dash light itself??

M

anonymous-user

Original Poster:

61 months

Monday 7th February 2022
quotequote all
Thought it was all LED on a Td5?

LandieMark

1,827 posts

155 months

Monday 7th February 2022
quotequote all
Should be LED as above. The wires are exposed around the gearboxes and it could have chafed through.

Shorting the lead won't do much good. Try bridging the connection. Positive comes down and back up to the light, I think.

anonymous-user

Original Poster:

61 months

Monday 7th February 2022
quotequote all
I’ve tried bridging it and shorting it direct to earth.
Still nothing.
My understanding was that there’s a +ve feed to the light that earths via the switch?

camel_landy

5,085 posts

190 months

Monday 7th February 2022
quotequote all
Crossflow Kid said:
Thought it was all LED on a Td5?
Either way, don't make assumptions.

M

LandieMark

1,827 posts

155 months

Monday 7th February 2022
quotequote all
Crossflow Kid said:
I’ve tried bridging it and shorting it direct to earth.
Still nothing.
My understanding was that there’s a +ve feed to the light that earths via the switch?
You will need to trace the wiring using the relevant wiring diagram. It is most likely a broken wire or the dash cluster.

anonymous-user

Original Poster:

61 months

Monday 7th February 2022
quotequote all
Yes I know.
I was asking if there’s a known weak point somewhere.

LandieMark

1,827 posts

155 months

Monday 7th February 2022
quotequote all
Crossflow Kid said:
Yes I know.
I was asking if there’s a known weak point somewhere.
I've already told you. The wires are exposed from where they run around the gearbox into the main loom.

You will need to test the dash cluster though to rule that out otherwise you will end up going around in circles.

I am assuming there is definitely continuity through the switch when difflock is engaged. The switch doesn't earth, it just switches.

Edited by LandieMark on Monday 7th February 21:49

anonymous-user

Original Poster:

61 months

Monday 7th February 2022
quotequote all
I’ve bridged across the switch terminals, and tried shorting it to earth.
Either way, still nothing.

LandieMark

1,827 posts

155 months

Monday 7th February 2022
quotequote all
Crossflow Kid said:
I’ve bridged across the switch terminals, and tried shorting it to earth.
Either way, still nothing.
Time to get the power probe out.