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

[Eric Russell]

So, the blown fuse turned out to be an I-D-10-T issue. When I crawled up
under the hood of the new (to us) motorhome to change the oil (they do not
make this an easy task...) I noticed a box way over on the left side
labeled "Battery Control Center (Fuses Inside)". And buried therein was
fuse # F17 'Cargo Lights'. Which indeed was blown. Maybe Thor (the
motorhome manufacturer) was trying to tell me to check there - but I
clearly described the place I had checked was the Ford "Power Distribution
Box".

EjR


On Thu, Nov 11, 2021 at 8:57 AM Eric Russell <ejrussell61 at gmail.com> wrote:

> 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
>


-- 
Eric Russell
Mebane, NC
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