TRF catalog shows 2 cables from battery. One goes to starter solenoid the
other to the chassis.
Whether braided or round should not matter as long as they are heavy enough
to be actual battery cables and your connections are clean and tight.
I would not jump on it as a grounding problem if you have had no other
electrical issues.
Modern cars with O2 sensors also have voltage stabilizers in the gauge
circuits which may be necessary to get the consistent meter readings.
Voltage variations in a TR6 are probably normal for the standard equipment
of the day.
----- Original Message -----
From: "Darcy Hunter" <darcyhunter@comcast.net>
To: <6pack@autox.team.net>
Sent: Sunday, December 16, 2007 5:39 AM
Subject: [6pack] Proper Grounding of TR6
> Got a question regarding the grounding of my TR6. I added an O2 sensor
with
> the proper readout device to my TR6 about a year ago. My hope is to use
it
> to set-up the SU needles. Gage seemed to work well except that any time I
> turn on another electrical device like lights or fan blower, the readout
> shifts. I knew I needed to get this sorted and did a little work to try
and
> assure myself I was getting a consistent 12 volts. Nothing obvious so it
> went on the back burner until this past Friday. I was flying home from
the
> UK and sitting beside a gentleman who was a car buff having a 911 and a
914
> w/ Wankle engine. When I described the problem, he immediately diagnosed
as
> having ground leakage. Seemed good to me then I started thinking about
how
> the body was strapped to ground. I had no good ideas and looking around
the
> various catalog schematics were no help. I have been through most of the
> car over the years and have seen no ground straps except those associated
> with the steering column facilitating horn operation.
>
> My one "ah hah" was when I looked more closely at the ground cable going
> from the battery directly to the engine block. Mine is a heavily insulted
> black cable similar to the red positive. Is that cable supposed to be
> strapped to the body on the way down to the block? If so, anyone know if
a
> '73 would have a braided cable or insulated with a small section stripped?
> Thanks and hope those in New England are enjoying the snowy morning.
>
>
>
> Darcy Hunter
>
> '73 TR6
>
> North Easton, MA
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