Sidelight/Rear lights issue

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I have been poking around at my wiring.

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Reconnected turbo timer

(just a plug, works fine), had my stereo out and reconnected all the wires due to crackly speakers and taped off a redundant old aerial wire.

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i had cable tied up some wiring under drivers footwell to tidy it.

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Plugged the cig lighter back together.

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moved an aftermarket colt gauge from the clock recess to glovebox as i want a stock clock back in.

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all seemed fine EXCEPT.

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Now the sidelights and rear lights fuse keeps blowing

(15A in drivers footwell)

I' stumped i am trying to retrace my steps see if i left a bare wire touching metal etc but no joy.

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Any ideas appreciated! I'm not the beat with wiring!