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Eric, There are devices (sometimes called 'tone generators' or similar)
that are two parts. One piece you put on the wire, the other creates an
audible tone as it gets anywhere close to the wire. You can use this as a
means to follow the wire.
One other possibility... is it possible that another bulb is burnt out and
that is acting as a fuse? Maybe all the fuses are good? Do you have a
multimeter to check the wiring?
Just some thoughts.
Moose
From: Eric Russell <ejrussell61@gmail.com>
To: Shop Talk <shop-talk@autox.team.net>
Date: 11/10/2021 19:18
Subject: [Shop-talk] Finding a Blown Fuse (Automotive)
Sent by: "Shop-talk" <shop-talk-bounces@autox.team.net>
Oh wise & beneficent Shop Talkers - I've run into a situation that has me
stymied. I need help locating a blown fuse in a motorhome.
We recently bought a new (to us) motorhome. When installing the signal
booster for a TPMS (Tire Pressure Monitoring System) I
accidentally shorted a 12V wire in the cargo bay lights. There was a small
spark (followed by a few swear words). I then went on a hunt for the blown
fuse. There are three fuse panels in this motorhome. Two in the Ford
chassis (F-53) - one under the hood and the other inside near the parking
brake - plus one in the motorhome's 120V - 12V power converter. I could
not find a blown fuse anywhere.
I contacted the manufacturer (Thor) who has actually been quite responsive
& has tried to help. After asking for my vehicle's VIN they emailed me
some schematics (not actual wire diagrams but more a map showing the
general location of outlets, switches, etc with indications of which
circuit they belong to). There are two schematics that appear to apply to
my motorhome - one indicates the cargo lights are connected to the Ford
panel by the parking brake, another indicates they are in circuit #6 of
the converter's 12V panel. Neither of those fuses are blown. While there I
checked all the fuses I could locate - none were blown. I've also signed
up to a couple of motorhome forums but have not been able to find an
answer there.
Finally - my plea for help - is there any device one can use to trace
where a circuit originates? I've seen an electrician use a device to find
out what outlet goes to which breaker in our house.
I've followed the hot wire from the cargo bay light back to where it
enters a wire harness along the motorhome's frame rail. I'm loath to rip
open the wire harness trying to chase the wire further upstream. As far as
I can tell there is nothing else in this circuit - everything else is
working properly. Of course I can live without cargo bay lights but it
bothers my OCD to have it not working (when I know it did before my screw
up).
--
Eric Russell
Mebane, NC_______________________________________________
Shop-talk@autox.team.net
Archive: http://www.team.net/pipermail/shop-talk
http://autox.team.net/archive
http://autox.team.net/mailman/options/shop-talk/eric@megageek.com
--=_alternative 0043298A8525878A_=
<font size=2 face="sans-serif">Eric, There are devices (sometimes
called 'tone generators' or similar) that are two parts. One piece
you put on the wire, the other creates an audible tone as it gets anywhere
close to the wire. You can use this as a means to follow the wire.</font>
<br>
<br><font size=2 face="sans-serif">One other possibility... is it possible
that another bulb is burnt out and that is acting as a fuse? Maybe
all the fuses are good? Do you have a multimeter to check the
wiring?</font>
<br>
<br><font size=2 face="sans-serif">Just some thoughts.</font>
<br>
<br><font size=2 face="sans-serif">Moose</font>
<br>
<br>
<br>
<br><font size=1 color=#5f5f5f face="sans-serif">From:
</font><font size=1 face="sans-serif">Eric Russell
<ejrussell61@gmail.com></font>
<br><font size=1 color=#5f5f5f face="sans-serif">To:
</font><font size=1 face="sans-serif">Shop Talk
<shop-talk@autox.team.net></font>
<br><font size=1 color=#5f5f5f face="sans-serif">Date:
</font><font size=1 face="sans-serif">11/10/2021 19:18</font>
<br><font size=1 color=#5f5f5f face="sans-serif">Subject:
</font><font size=1 face="sans-serif">[Shop-talk]
Finding a Blown Fuse (Automotive)</font>
<br><font size=1 color=#5f5f5f face="sans-serif">Sent by:
</font><font size=1 face="sans-serif">"Shop-talk"
<shop-talk-bounces@autox.team.net></font>
<br>
<hr noshade>
<br>
<br>
<br><font size=3>Oh wise & beneficent Shop Talkers - I've run into
a situation that has me stymied. I need help locating a blown fuse in a
motorhome. </font>
<br>
<br><font size=3>We recently bought a new (to us) motorhome. When installing
the signal booster for a TPMS (Tire Pressure Monitoring System) I
accidentally shorted
a 12V wire in the cargo bay lights. There was a small spark (followed by
a few swear words). I then went on a hunt for the blown fuse. There are
three fuse panels in this motorhome. Two in the Ford chassis (F-53) - one
under the hood and the other inside near the parking brake - plus one in
the motorhome's 120V - 12V power converter. I could not find a blown fuse
anywhere. </font>
<br>
<br><font size=3>I contacted the manufacturer (Thor) who has actually been
quite responsive & has tried to help. After asking for my vehicle's
VIN they emailed me some schematics (not actual wire diagrams but more
a map showing the general location of outlets, switches, etc with indications
of which circuit they belong to). There are two schematics that appear
to apply to my motorhome - one indicates the cargo lights are connected
to the Ford panel by the parking brake, another indicates they are in circuit
#6 of the converter's 12V panel. Neither of those fuses are blown. While
there I checked all the fuses I could locate - none were blown. I've also
signed up to a couple of motorhome forums but have not been able to find
an answer there. </font>
<br>
<br><font size=3>Finally - my plea for help - is there any device one can
use to trace where a circuit originates? I've seen an electrician use a
device to find out what outlet goes to which breaker in our house.</font>
<br>
<br><font size=3>I've followed the hot wire from the cargo bay light back
to where it enters a wire harness along the motorhome's frame rail. I'm
loath to rip open the wire harness trying to chase the wire further upstream.
As far as I can tell there is nothing else in this circuit - everything
else is working properly. Of course I can live without cargo bay lights
but it bothers my OCD to have it not working (when I know it did before
my screw up). </font>
<br>
<br><font size=3>-- </font>
<br><font size=3>Eric Russell</font>
<br><font size=3>Mebane, NC</font><tt><font
size=2>_______________________________________________<br>
<br>
Shop-talk@autox.team.net<br>
Archive: </font></tt><a
href="http://www.team.net/pipermail/shop-talk";><tt><font
size=2>http://www.team.net/pipermail/shop-talk</font></tt></a><tt><font size=2>
</font></tt><a href=http://autox.team.net/archive><tt><font
size=2>http://autox.team.net/archive</font></tt></a><tt><font size=2><br>
<br>
<br>
</font></tt>
<br>
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