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

[John]

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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