Author Topic: UPDATED - Rear SON dynamo light wiring issue  (Read 119 times)

kwkirby01

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UPDATED - Rear SON dynamo light wiring issue
« on: November 28, 2020, 01:42:00 PM »
I have an Edelux front light powered by a Shimano DH-2N70 dynohub fixed to the bike with a metal bracket.

I thought I had carefully then carefully followed the instructions for connecting my SON rear light, but when I connect the the rear light neither front nor rear work. Disconnect the rear and the front works.

Can anyone on the forum give me some guidance as to where I'm going wrong?

Thanks, Kevin

« Last Edit: November 28, 2020, 02:46:53 PM by kwkirby01 »
Kevin K. Glasgow

PH

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Re: UPDATED - Rear SON dynamo light wiring issue
« Reply #1 on: November 28, 2020, 07:01:17 PM »
Oh dear, I've wired up several rear lights, to a few front ones, including a couple of Edelux and as you'd expect they've been straightforward, though I haven't had a SON rear. 
I'm pretty sure polarity isn't relevant, all the same if it's simple enough, I'd try swapping the wires round to start with.
Knocking the front light out sounds like a short, is there anywhere the wires could be touching? if not it's a process of elimination, the need to establish if the problem is the front connection, the rear connection or the wire in between... a swap test with a different setup would be ideal, or a multi meter or just a different bit of wire between the lights. If you don't have access to any of those, a circuit tester is only a couple of quid and a handy thing to have.   

https://www.toolstation.com/circuit-tester/p53383

Good luck
« Last Edit: November 28, 2020, 07:04:42 PM by PH »

leftpoole

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Re: UPDATED - Rear SON dynamo light wiring issue
« Reply #2 on: November 29, 2020, 11:38:20 AM »
Somewhere along it is earthing out. In my opinion. Based on 'expert' experience.
John