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New car battery installed alarm now won't stop


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Hi all.  Ok so had to install new car battery today in a 2011 cmax. All was going well until putting the neg terminal back on , now the horn blares, headlights, wipers come on and head washers pop out and horn won’t stop until I remove neg lead from battery

Weirdly also the Dash spedo is also stuck at 60mph.
Car has keyless entry. I tried locking unlocking car with the hidden key in the fob but getting no where fast 
Any ideas what I have done wrong and how can I sort this please ?


thanks all 

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