Another bee sting - cant get horn to work in GQ Patrol

Loom has been out, finishing up the final run of hook ups before VASS engineering. I cannot get the horn to work, have had the steering bits off, all look fine, it activates by completing the earth circuit, but wont work by pushing the horn pad in the steering wheel, but will squeek like a mouse if direct powered. Almost like its starving of power - any ideas - 3 bloody wires, Killing me. I have tried different horns as well, same root cause.

I have the horn body earthed and the power goes thru the horn to earth. All connections by the wiring diagram, have swapped the relay, nuffink!!!!

Ex Member Dom did a horn pad reco thread. http://www.nissanpatrol.com.au/forum...with-this-horn

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Originally Posted by Eatmyshortz

Ex Member Dom did a horn pad reco thread. http://www.nissanpatrol.com.au/forum...with-this-horn

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Thanks EMS, I recall when DOM was around. I dont have this assy in my horn assy - the problem is lack of power getting to the horn I think. I have bypassed the actual steering wheel 'switch' and its pissweak. The horn sings ok if hooked direct to the battery, so I know it works. I am missing something, just cant see what.

I just found the the circuit in the factory workshop page EL 64. I never knew the was a horn relay in the circuit. Maybe a bad connection there. Page EL80 says the relay is located at 134M connector along the drivers side guard if it is actually fitted.

Have you measured the voltage when the horn is pressed?

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Originally Posted by mudski

Have you measured the voltage when the horn is pressed?

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Mark, good question as I see the power comes off a constant power source, so should be 12V, however its dead, perhaps indicating there is an issue back in the loom. If I jumper the power directly off the battery into this power wire, I get a pissweak response at the horn, and if I leave the jumper on with constant power, the response is zero pushing the steering wheel pad. The fuses are all fine.. Almost looks like another cable connection may be missing or a plug not connected, however the wires all disappear into a taped up loom, so unsure thats a line of enquiry.

I will see if I can measure the transmitted volts when doing the battery jumper next time I am at the shed. Frustrating.

I think I will just run an independent circuit and piff the original, doing my head in.

‘La Cucaracha’ , via an ARB Twin compressor with at the least say 15-20 L of 150psi tank storage should suffice [emoji123][emoji123]
Old Mate CertiEngineer will surely sook right the “get out of my premises” [emoji120][emoji120][emoji182]


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OK, think I have this sorted now, just have to drop the loom into the truck to confirm, but it works on the bench
Attachment 87682

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Originally Posted by MB

‘La Cucaracha’ , via an ARB Twin compressor with at the least say 15-20 L of 150psi tank storage should suffice [emoji123][emoji123]
Old Mate CertiEngineer will surely sook right the “get out of my premises” [emoji120][emoji120][emoji182]


Sent from my iPhone using Tapatalk

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I bought a pair of Farbin 12v horns, holy shit they are noisy.

The man loves to live dangerously! No fuse needed.

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Originally Posted by Eatmyshortz

The man loves to live dangerously! No fuse needed.

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Fuses are for sissys!


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Originally Posted by mudski

Fuses are for sissys!


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The feed is from an accessory fuse panel, so yes its fused, I have generated more than my share of smoke events to not go that path!

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Originally Posted by PeeBee

The feed is from an accessory fuse panel, so yes its fused, I have generated more than my share of smoke events to not go that path!

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Haha! No doubt you have old mate! I've seen the bird nest/ wiring in your Patrol pre rebuild. Its a surprise you have burnt the whole vehicle down yet.

Based on what you’ve described, it could be worth checking if there’s any resistance in the earth connection, even if everything seems fine visually. A weak or intermittent ground could cause that “squeaking” noise since it’s not allowing enough current to flow through the circuit. I’ve seen this kind of issue before where the connection looks solid, but cleaning or tightening it up fixes the problem.

If you’re still stumped, you might want to check out bosshorn.com for some additional tips or parts that could help troubleshoot electrical components like this. They’ve got some resources that could be handy for figuring out what’s going wrong.