[TR] TR4A Parking Lights

Randall tr3driver at ca.rr.com
Sun Nov 3 09:13:59 MST 2019

The headlight switch does not need to be grounded.

I think you are probably looking at a bad connection or a broken wire, that makes contact when you hold the housing a certain way, then opens up when you hold it a different way.  Could be inside the switch, could be one of the wires in the column.

As an EE friend of mine used to say, a test is worth a thousand theories.  Probe the red with green wire with a suitably grounded test light, at the switch, then move things around until the lights go out.  If the test light stays lit, the problem is between where it is connected and the lights.  Otherwise the switch is bad.  (It’s quite possible for one switch contact to fail or become intermittent while the others still work).

-- Randall

From: G.D. Huggins
Sent: Sunday, November 3, 2019 7:32 AM
To: Triumph Mailing List
Subject: [TR] TR4A Parking Lights

Accidentally, I jostled the bell-shaped upper part of the steering column to which the switches are secured, and they came on!
On closer inspection, that bell-shaped part is separate of the main steering column, and had become loose.
I manipulated that bell section and the parking lights would come on, or go off, depending on what I was doing.

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