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when checking resistances remember you are checking "off load" ie using the multimeter battery only --this can lead to false readings especially when wires are old or contacts corroded
It can be worth checking continuity with a 12 volt battery -supply 12 volts to one end of the wire you are checking and check for 12 volts with the meter -expect almost zero volts drop -even better use a bulb at the other end as this now check the wire "on load"
often I have found the continuity is good ohms wise with a meter and volts drop very small ,but a bulb fails to light up - due a high resistance in the circuit
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