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Discussion Starter #1
Got hold of a trailer yesterday when I connect it up it says bulb failure L/H R so i check the bulbs both on my car and the trailer all the bulbs are fine., Could it be the connection between the trailer?
 

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Left-hand rear what? Side/tail/reverse/indicator/etc?

What happens when you plug the trailer in and switch on the circuit listed as faulty? Do the corresponding trailer/car lights operate?
 

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LEGACY VENDOR
1995-2002 Range Rover P38A
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More info, more info please :?

Scotty
 

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i get the same issue ONLY when I connect a trailer with the lights. I get "RH BRAKE BULB FAILURE" and as soon as I disconnect the trailer, all is fine and the message never shows, i thought maybe it was telling me the trailer brake light is bad
 

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Does the light work when the failed message is up?

Plug your trailer into a known good socket and see what happens.

Try a known good trailer/board on your car and see what happens.

By then you should know exactly where the problem is.
 

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This happens because both the brake lights(trailer) are on the same circuit, when you brake the car thinks a bulb has blown as there is an imbalance left to right.
 

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Do you have straight wiring into the factory harness or do you have the LR trailer module? Does the trailer warning light on the dash operate?

Without the module your truck thinks the bulb on whatever side you are directly wired to is blown because has a voltage difference.
 

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Discussion Starter #10
I get LH BRAKE BULB FAILURE but all the bulbs work the trailor indicator on the dash works fine. I think john-sussex is right probably just wired up different to the trailer I used the other day.
 

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john-sussex said:
This happens because both the brake lights(trailer) are on the same circuit, when you brake the car thinks a bulb has blown as there is an imbalance left to right.
so its normal?
 

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Not too sure as you are across the pond from me, but in the uk it is common for the light to be independent but both brake lights are one. I used to have a Volvo and to get round it the wiring was attached to the fuse box.
 

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JACK'S GRANDAD
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You just need a converter box is all.
The trailer has brake/turn signals together, the RR has them separate.
I solved mine with a converter box that also protects the RR ecm's should a short occur.

Martin
 
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