It is likely a ground issue. Red wire on the tester to the wire to the bulb
and black wire on the tester to ground. If a 72 is like my 69 when you open
the trunk lid the plunger is released near the right side hinge, and a
ground is created and the bulb lights. I am assuming mine is correct.
Test your holder creating a new ground with the tester. If it indicates
current and the bulb is known to be good, check out that ground switch.
Cool design BTW. If the ground fails, and makes a ground with the trunk
closed. your battery has an unfortunate message for you.
On Tue, Aug 25, 2009 at 7:14 PM, Jim Muller <firstname.lastname@example.org> wrote:
> On 25 Aug 2009 at 17:49, email@example.com wrote:
> > If I select volts and attach the two leads to where the bulb plugs
> > in, it should show something if it is getting power, and nothing
> > if it is not getting power, correct? I don't want to fry anything.
> If the meter isn't broken it won't blow anything, so don't worry
> about that. If you have the wires attached backwards, the meter may
> try to jump backwards if it is a needle and meter display, or the
> digital display may show a negative voltage, but that's okay too.
> If you just have a burned out bulb, you should see voltage between
> those terminal. But maybe you won't see any voltage at all. It is
> possible the wiring isn't right and the bulb is fine, or both could
> be a problem. For example, the ground side (i.e. the "negative"
> side) may simply have a poor connection to ground. I don't know what
> the TR6 trunk switch is like, but the one on my Spitfire sometimes
> just doesn't make good contact to ground unless it it is jiggled a
> bit. A problem like that would make the reading be zero. Maybe you
> don't even know which terminal is positive and which is ground. So
> another test is to attach the meter's negative wire to a good chassis
> ground, not paint, then touch the other wire to each of the terminals
> in the light socket. When you touch the positive side the meter will
> show it. If neither side shows a positive voltage and you are
> absolutely sure your ground connection is good, then the problem is
> in the wiring that feeds power to the socket.
> Jim Muller
> '80 Spitfire, '70 GT6+
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