Re: Battery Drain
From: Doug & Terri (dntdock.net)
Date: Fri, 15 Jun 2018 15:41:42 -0700 (PDT)
CTEK is good - or Battery Tender.
If using Battery Tender remember to hook up battery to the Tender THEN plug
in to wall socket.
DOUG

-----Original Message-----
From: Ferrari [mailto:ferrari-bounces+dnt=dock.net [at] ferrarilist.com] On
Behalf Of Larry Bard
Sent: Friday, June 15, 2018 3:06 PM
To: DOUG <dnt [at] dock.net>
Cc: The FerrariList <ferrari [at] ferrarilist.com>
Subject: [Ferrari] Battery Drain

What's wrong with keeping it on a trickle charger?  I use a CTEK each winter
on my 512TR.

________________________________
From: Ferrari <ferrari-bounces+larrybard=hotmail.com [at] ferrarilist.com> on
behalf of Doug & Terri <dnt [at] dock.net>
Sent: Friday, June 15, 2018 2:37 PM

Martin notes "Hard to believe that the clock and radio alone can drain the
battery so quickly."

Its not just the clock and the radio anymore.  While the following may not
be a participant to your battery drain a Ford tech friend (working out of a
SoCal dealership) of mine was faced with a Bronco, a brand new one, that ate
a battery in three days.  Whaaa?  Ayep.  Traced this, traced that, replaced
batteries - to no avail.  He finally got an answer from their US wide data
base out of Minnesota.  The problem?  It was the anti-lock braking system
(ABS).  Huh?  Ayep yet again.  Bad ground.  Whaaa yet again?  Seems that
when the vehicle was parked and shut off the computer picked up a "locked"
RF wheel.  It continually tried to unlock it and allow it to roll before
sensing another phony "lock up" problem.  That gobbled electrons like crazy
- poooof no battery in three days.

SO - while your TR may not have an electronic ABS there may be a creepy
parasitic drain that is nearly untraceable.  Thing to do is disconnect the
battery ground at the post, disconnect the. Clock and radio (via fuses if
possible) and at night - to insure it's real dark just touch the ground
terminal with battery clamp.  Even a tiny tiny spark suggests a parasitic
drain somewhere.  If that occurs find someone to trace components using the
"voltage drop" test.  DON'T just use an ohm meter.  An ohm meter will give
you bad "good results" if just one tiny strand of wire is still in the
circuit.  That is it would report that a starter main wire is "good" if only
one strand of wire remains between the battery and starter in an otherwise
bad current conducting wire.  This most likely isn't your problem as your
starter seems to jump to life with a well charged battery.

The other trick to do is just do as you have - use the switch.  Whatever is
eating your battery may make no never mind as you enjoy your car.  Be glad
your TR isn't OBDII - that system has more computers than a Saturn V and no
car sold in the USofA from model year 1996 forward is without it.  It
pertains to emissions.

Onward and good luck
DOUG

-----Original Message-----
From: Ferrari [mailto:ferrari-bounces+dnt=dock.net [at] ferrarilist.com] On
Behalf Of Martin Stark
Sent: Friday, June 15, 2018 10:11 AM
To: DOUG <dnt [at] dock.net>

I should add that's there's no Ferrari content in my question. So to include
a little I can report that upon my return from points south my
'87 TR fired right up after sitting all winter. That's been the case since I
began turning off the battery switch whenever the car going to be sitting
idle for more than a couple of weeks.  Hard to believe that the clock and
radio alone can drain the battery so quick

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