Totally baffled

mickysf
mickysf Forum Participant Posts: 6,474 ✭✭✭
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edited January 2021 in Motorhomes #1

Plugged Avtex TV in 12 volt socket and switched on, not working! But was that plug indicator light blue, it's now orange, was it always orange? Try TV on 230volts, works fine. Go to fuse box, clearly fuse to tv blown but why is plug indicator still glowing? Get out multimeter. Shows 2.6 volts at socket, how can that be? Change fuse, 12 volts restored at socket. TV now working fine, what on earth has gone on?

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  • peedee
    peedee Club Member Posts: 9,387 ✭✭✭
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    edited January 2021 #2

    With so many wires running in close proximity of each other in caravans and motorhomes it could be an induced voltage from other live wires running alongside the ones supplying your TV power socket?

    peedee

  • Navigateur
    Navigateur Club Member Posts: 3,880 ✭✭✭✭✭
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    edited January 2021 #3

    Does the "TV fuse" supply other sockets, and are there other things plugged into them? Another device could be supplying the voltage you see.

  • mickysf
    mickysf Forum Participant Posts: 6,474 ✭✭✭
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    edited January 2021 #4

    Thanks for suggestions, I'm open to any theories. No, nothing else plugged in elsewhere in the circuit. I'm also doubtful that an induced DC could be generated to this voltage in the loom or other wiring but there again I'm no auto electrician. 

  • Phishing
    Phishing Forum Participant Posts: 597
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    edited January 2021 #5

    As previously stated it could have been induced from another cct, caravan wiring is so badly designed that you get all kinds of induced voltages on the LV circuits. If you measure the current in these circuits they usually read 0A indicating it is an induced voltage.

    Alternatively the antenna amplifier is active and can induce a spurious voltage on the 12v rail.

    The other option is that you have a circuit fault on the 12v cct. The fuse was blown and this should not really happen on a TV. The 12v cigar lighters are really poor and can go short cct., I have had them fail.

  • mickysf
    mickysf Forum Participant Posts: 6,474 ✭✭✭
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    edited January 2021 #6

    Cheers phishy, what I'll do is disconnect 230v from the van and check the 12v system again. I'd be very suprised if without AC running through the veins of the van there is any induced voltage. I'm still intrigued and would like to get to the bottom of this though.

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