Fully run in and going strong!
Join Date: Oct 2014
Glad you are sorted.
Battery condition, and quality of all earthing points should be the first check for most electrical problems.
With any NO/NC mechanical relay the internal coil has to overcome a spring for the relay to operate. The steady-state force exerted by the coil is proportional to the current flowing in it. That current is proportional to battery voltage (or more accurately, the voltage seen across the coil). Usually a relay will just switch or not switch, given the battery voltage - it is unusual (but possible) for the voltage to be at the precise level where the relay works, but then something is switched on so that that load is just enough to drop the voltage to the point where the relay coil is no longer powerful enough, setting up an on/off resonance!
2014 Nav D40 V6
The plural of anecdotes is not data. Anecdotes however, are better than hearsay