[TR] OD wiring A-type TR3A

Geo Hahn ahwahneetr at gmail.com
Sat Dec 7 07:10:02 MST 2013

Ronnie --

Here's a diagram...


As Randall notes, there are 3-terminal relays in the world -- I use one on
my brake lights but that works because I am controlling power.  As you can
see in the diagram OD switch controls the ground side of the equation.

If interested I have versions of that diagram wherein I have added the
diode suggested (elsewhere) by Randall.  I also added a fuse and indicator
light but all this can come later after you have the thing working.


On Sat, Dec 7, 2013 at 12:25 AM, Randall <TR3driver at ca.rr.com> wrote:

> > I have 2 different relays both say they are 6RA the original
> > looking one
> > has
> >
> > double C1
> >
> > single C2
> >
> > single W1
> Look again, Ronnie.  I think you will find that there is a W2 as well as a
> W1.  6RA relays did come in various configurations, but
> the original OD relay should have had C1-C2-W1-W2.
> If not, you are going to need to do some detective work to find out how it
> is actually wired inside.  Use an ohmmeter to find a pair
> of terminals that shows around 10-15 ohms resistance.  Those terminals are
> W1 & W2 (doesn't actually matter which is which).  Double
> check that there is no continuity (infinite resistance) between the other
> pair of terminals.  I would also take the next step of
> applying 12v across the W1 & W2 terminals, and check that the other pair
> of terminals go to zero (or nearly zero) ohms.
> White - W1
> Brown - C1
> YG - W2
> YP - C2
> If the coil is grounded to the case (as your terminal numbers would seem
> to indicate), then you'll need to look for a different
> relay.
> Randall
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