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Beware fault indicating fuses!

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  • Beware fault indicating fuses!

    I have a six way fuse block connected to my 2nd battery and it has LEDs to indicate if the fuse is blown - actually only indicates if it is a short circuit that caused the fuse to blow (and the short is still present) so really not much good anyway.

    My primary battery died the other day and when I went to start I got clicking solenoids but nothing more. I thought 'that's OK I have a start override', pressed the button, the Redarc switched on, I tried to start and didn't get much more than without it I got my jumper leads, connected the two batteries together and it then started first time.

    I've confirmed that my primary battery is dead and got a new one but before I fitted it I did some investigating as to why the start override didn't seem to work.

    I connected the start override directly to the 12V without going through the switch and it started with no problem despite the dead primary battery. The only difference I could see was that my override circuit was powered from the fuse block.

    Further investigation revealed the cause - the fuse was blown! Because of the blown fuse detection circuit the fuse block would pass enough current to switch the Redarc but as soon as I tried to start, the override was dropping out and hence dropping back to just the primary battery. If it had been a normal fuse block then it would have been obvious as the override wouldn't have worked at all.

    I've now wired the override switch directly to the 12V and all is well.

    Bit of a long story but worth remembering that just because you have power doesn't mean the fuse hasn't blown if you have one of these fuse blocks.
    Trekrider
    Banned
    Last edited by Trekrider; 14-12-2012, 05:32 PM.
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