[Shop-talk] Finding a Blown Fuse (Automotive)

[Eric Russell]

Thanks for the replies. It may be a week or more before I gather the energy
to search for the fault again. I've already wasted two afternoons and have
other more important things to do (getting ready to go racing in VRG's
Turkey Bowl at Summit Point, WV). The idea of using a tone generating tool
is interesting. Horrible Fright has a $25 version - I may give that a try.

EjR


On Thu, Nov 11, 2021 at 8:12 AM John <jbach at swiftrecruiters.com> wrote:

> How about a GFCI outlet that has tripped?
>
>
> On 11/10/2021 7:15 PM, Eric Russell wrote:
>
> 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
>
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-- 
Eric Russell
Mebane, NC
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