Starting issue (bad earth?)

Starting issue (bad earth?)

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Hi, I have a megane 1 1999. I have an intermittent starting fault.sometimes it only happens once a month sometimes it happens every other day. When I go to start it nothing happens, only a click. And when I switch the ignition on, the gauges go up and down and most of the dash lights flash like a Christmas tree, the plip key makes the windscreen wipers go, as does the drivers window switch, the heater makes a really weird noise too. To start the car it's pretty simple I just disconnect battery negative lead, leave it a few seconds and reconnect and it starts fine. It seems like an earth fault as all of the electrical systems go wild. Most days this issue won't happen and the car will start as normal.
Any help on this matter would be appreciated
Thanks

Currently in Witheroe's garage:
1999 Renault megane 1.6rt

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Starting issue (bad earth?)