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SON y junction box grounding question

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SON y junction box grounding question

Old 11-23-21, 01:20 AM
  #1  
andreracicot
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SON y junction box grounding question

Son edlux II (k607) front light

b+m Line small plus rear tail light

SON delux (k687) hub

Bought the y junction and just getting ready to wire this up.

Im going to cut the 2.8m male spades off the rear light and solder the rear light twin leads to a run of (bm) coax up to the front where it will plug into the y junction box.

My question is: Does this return leg need to be grounded to the frame (its steel) or to the front light mount/brake mount?

Or is the circuit grounded at the front hub through the return leg?
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Old 11-23-21, 10:57 AM
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Have you looked at the Peter White website for wiring information?

I do not understand what you are trying to do with a Y connector, taillights should be wired to the headlight so that the headlight switch and over-voltage protection is also used to control and protect the taillight.
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Old 11-23-21, 12:17 PM
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unterhausen
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The y box includes both power and ground through the coax cable connectors. So no other connections need to be made. Obviously, you are going to have to wire the coax up to both the power and ground inputs of the taillight. If the taillight has a grounded mount, you may want to disconnect that. Probably won't cause any problems though, but I know people that do it.
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Old 11-23-21, 02:05 PM
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In the past using frame as a ground connection served to eliminate one wire. It was accomplished by connecting one terminal of a device to any metal frame. However, this was notoriously unreliable. It still lingers at low end, but current higher end practice is to run two wires to every device, for the reliability. Nether of SON terminals is normally connected to any metal touching the frame, but there may be a connection there for some BM rear lamps. The best practice is to avoid any connection to the frame when possible. If only one device is wired to the frame, there should be no problem. If two or more are wired, it is best to check the connections with a meter as a miswiring can yield problems.
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