Big problem (1 Viewer)

[nunny666]

Hi my vehicle is a fiat hyma b534 1994 , my problem is that when I had to pull fuse / relay box out from down by drivers side (holds the bullet fuses )I noticed thst the metal part of fuse box seems live , I get sparks when it touches chassis , exact same happens with 12 v isolator off , any suggestions or help appreciated
The problem must be inside the fuse box ,on one of connections, or a live is touching the box somewhere ?? At a loss

 

[funflair]

Hi

Check it out with a multi meter as just one spark could be earthing some static electricity from you, if the meter shows it to be live then as you say there is a problem that needs tracing but can't help.

Martin

 

[nunny666]

Yep tested with multi meter if I touch metal box with one probe then you've chassis with other I get 12.8 v , thanks for time replying appreciated

^{_{Subscribers  do not see these advertisements}}

 

[funflair]

You say you get the same with 12v isolator off, the habitation 12v I guess. The fuse box you are working on will be from the vehicle 12v system so isolating the vehicle battery would/should stop it then you could check for a connection between the box and all the fuse holders on the box.

Martin

 

[nunny666]

You say you get the same with 12v isolator off, the habitation 12v I guess. The fuse box you are working on will be from the vehicle 12v system so isolating the vehicle battery would/should stop it then you could check for a connection between the box and all the fuse holders on the box.

Martin

Yes that's right buddy , tho their is a loop wth fuse and holder that links starter battery and leisure battery I believe

 

[hilldweller]

Yep tested with multi meter if I touch metal box with one probe then you've chassis with other I get 12.8 v , thanks for time replying appreciated

There is a chance they are using the fusebox as an earth return for some wiring. Maybe you are turning something on/off, but what ?

It can't be a dead short to 12V or you would definitely know about it.

^{_{Subscribers  do not see these advertisements}}

 

[steevie]

sounds to me like the fuse box back is just making up the earth circuit, and as said, it would be a dead short were it any other scenario. It needs to be clean and rust free when you bolt it back in place.

 

[nunny666]

I have a question , if on multi meeting I get a reading of over 12 v on the fuse box , if I bolt that back in place will it not make the whole chassis live ? Or do I have my wires crossed pardon the pun , thanks again for advice , I was worried if a spark occurs it may start a fire , I shall disconnect battery while I fasten back in place to be safe then

 

[nunny666]

Sorry my phones guessing wrong words again I mean if on multi meter , not meeting lol

^{_{Subscribers  do not see these advertisements}}

 

[nunny666]

Or is the 12 volt reading on the box because it isn't direct earthed to chassis and that's what you are all saying ?think I understand now

 

[nunny666]

If I was to get some cable and attach one end to negative terminal on battery, then touch chassis with other end no spark , but if I did same with the fuse box, and touch it with other end if cable I would get sparks (with fuse box out ) so if I then clean chassis and bolt fuse box back , once in position it won't spark as it is grounded to chassis / correct ??

 

[Carol]

Have you sorted it or has any one else got any ideas.

^{_{Subscribers  do not see these advertisements}}

 

[nunny666]

Just finishing work to go check it out bit I think if I clean the chassis points up , disconnect battery , fit the fuse box back to chassis , then re attach battery . It should be fine , think it's only sparking because it's away from vehicle chassis at mo , once bolted firmly in place it should be ok , I will try and then report back , thanks everybody

 

[nunny666]

The only thing I am struggling with now is how it gets a good connection to chassis as the part of box screws go through is plastic ?

 

[nunny666]

So interesting I connected a cable from box to chassis to see if it was ok while the box was out , it set on fire ???

^{_{Subscribers  do not see these advertisements}}

 

[nunny666]

So the box is either not designed to touch the chassis at all , ( if that's the case why not use plastic altogether and no metal , be a lot safer , or do I have a wire thsts wrong inside fuse box that's making the box live when it should be opposite , the box actually screws through plastic , so no metal will touch chassis , even the screws won't , maybe this is just how the box is ??

 

[nunny666]

think I have found problem buddy I removed the block that connects all the wires in the fuse box , on one of the live wire bolts that the cables connect , it is stuck up and touching the metal housing , it has been replaced by someone at some point and dosnt fit in the recess like the rest , had tape on that rubbed through , thus making box live instead of neg , cheers for input let you know how it goes ,

 

[Hobbytwo]

Sorry but you've lost me completely. The fuse box itself should not be live, only the electrics within it. Sounds as though the casing is shorting onto a live somewhere.

^{_{Subscribers  do not see these advertisements}}

 

[nunny666]

That's exactly what it was , their are bolts which pass through plastic , the plastic is countersunk , so the bolt heads fit inside the plastic , in the past one of these bolts must if broke so got replaced , only trouble is the head of bolt fit flush not in countersink , so all they did was tape over head of bolt , the tapes rubbed off and thus making the box live , sorted now all I did was file head of bolt smaller to countersink it ,

 

[Hobbytwo]

Problem solved............well done.

 

[nunny666]

Yep buddy now I've to work out why my water pump is running with no taps on , no leaks , micro switches on taps so hope ones gone faulty lol

^{_{Subscribers  do not see these advertisements}}

 

[greyman1]

i have the same van as you and when my washroom tap started playing up it was the thin wiring to the microswitch inside the tap itself .it had been severed by the swivelliing action of the tap over the years . easily fixed with a bit of solder and insulation . regards garry

 

[nunny666]

i have the same van as you and when my washroom tap started playing up it was the thin wiring to the microswitch inside the tap itself .it had been severed by the swivelliing action of the tap over the years . easily fixed with a bit of solder and insulation . regards garry

Thanks for advice buddy I will strip tap down fir a closer look , appreciated

 

[nunny666]

Thanks for advice buddy I will strip tap down fir a closer look , appreciated

Any chance you can do me a big favour , as you have same motor , could you take a picture if the wiring and connector in the wardrobe just above water heater on right side as I seem to have blue wires connected to browns on that block , surely this is wrong but not 100 percent , it would be a great help if you could , cheers

^{_{Subscribers  do not see these advertisements}}

 

[nunny666]

This is how mine are , the two cables pulled off the connector block go to the first spade connector near to outside wall but others seem cross wired too ?

 

[nunny666]