S40 (New) Electrics : - Rear Number Plate Lamp

myutopia · Feb 15th, 2016, 13:08

My MOT is due and as usual I decided to check the usual basics such as the bulbs. The ones on my rear reg plate had blown and I replaced them but noticed that they only came on when I flexed the boot loom at the point next to the strut where it enters the car body. I stripped it back and saw that almost all the wires were snapped except one of the two blue/brown wires, the other one about to go anyway .

I stripped and twisted the wires together and covered with electrical tape, but still the number plate lamps wont come on, I've tried to see if there could be a break elsewhere but still can't find a break.

I decided to check if perhaps I had wired cross wired the two blue brown wires by mistake the result was that the number plate bulbs and the boot light all lit but very dimly so I'm sure the wiring was correct and the issue is further back, but tracing it all the way back and even using a second hand loom the result is the same. The rear number plate bulb still will not come on.

Any suggestions as I don't think there is a fuse for this.

There is a black box that the loom connects into on the boot but I can't see it being that.

myutopia · Feb 15th, 2016, 14:58

OK.... I didn't think it was the fuse because there was nothing obviosly wrong but ,,, yup it was the fuse...

I swapped the 10amp positions lamp fuse with the 10am parking lamp fuse and presto.... it worked.....

Didn't seem obvious to me that the Positions lamp fuse was related to the number plate.... but there you go.

Off to get a few spare fuses.

Feb 15th, 2016, 13:08	#1
myutopia New Member Last Online: Feb 15th, 2016 14:58 Join Date: Feb 2016 Location: Manchester	Rear Number Plate Lamp My MOT is due and as usual I decided to check the usual basics such as the bulbs. The ones on my rear reg plate had blown and I replaced them but noticed that they only came on when I flexed the boot loom at the point next to the strut where it enters the car body. I stripped it back and saw that almost all the wires were snapped except one of the two blue/brown wires, the other one about to go anyway . I stripped and twisted the wires together and covered with electrical tape, but still the number plate lamps wont come on, I've tried to see if there could be a break elsewhere but still can't find a break. I decided to check if perhaps I had wired cross wired the two blue brown wires by mistake the result was that the number plate bulbs and the boot light all lit but very dimly so I'm sure the wiring was correct and the issue is further back, but tracing it all the way back and even using a second hand loom the result is the same. The rear number plate bulb still will not come on. Any suggestions as I don't think there is a fuse for this. There is a black box that the loom connects into on the boot but I can't see it being that.

Feb 15th, 2016, 14:58	#2
myutopia New Member Last Online: Feb 15th, 2016 14:58 Join Date: Feb 2016 Location: Manchester	being a dumba$$$ I didn'#t realise it had a fuse OK.... I didn't think it was the fuse because there was nothing obviosly wrong but ,,, yup it was the fuse... I swapped the 10amp positions lamp fuse with the 10am parking lamp fuse and presto.... it worked..... Didn't seem obvious to me that the Positions lamp fuse was related to the number plate.... but there you go. Off to get a few spare fuses.

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