UK Car Repair Questions? Ask a Mechanic for Answers ASAP
I'd 1st check the tightness and cleanliness off the main battery connections and that of the main earth connections, there must be no corrosion on anything and all must be properly tight so they cannot be moved by hand
then there may be some high power fuses directly on the battery connectors these are rated at about 80 and 40 amp and are the primary fuses for the car so check these are in good condition
also follow the main positive lead back to the engine and down to the starter motor, and check the connection at this end as well.
Check the resistance of the main positive lead that runs down to the motor as anything more than a few ohms and it should be replaced
Don't forget to try a jump start from another car / battery as its possible the battery is poor, if you have a voltmeter a healthy battery should read 12.7+V
And one last thing is – how old is the battery? – As even good quality ones need replacing every 5 years and faulty battery just won’t hold a charge
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