The rapid clicking will be the starter solenoid. It does sound like there's not enough juice in the battery to crank the engine over. Has he tried a jump start?
"Y mae dafad ddu ym mhob praidd"
1972 4/4, 1981 MGBGT, 1984 FLHT1340, 1980 XLH1000, 1990 ZX10
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