Okay the two click is coming from the engine room or in the cabin, if coming
from the engine room then you may have a weak battery or bad starter motor .
With the voltmeter check the battery voltage , a good battery will have 12.6 plus volts
if you only have 12 volts or less you need to recharge or replace the battery ,
To load test the battery fitted try and start the engine keeping an eye on the voltmeter
if the voltage drops below 10 volts then starter is probably ok and just need to change or charge the battery .
check this then get back to me .
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Kind regards Greg..