When I get a fail light I pull the fuse or the computer plug rather than dick around with Battery terminals.
I get one about once a year or so because I am running a different transfer pump than factory and every now and then the 'poota figures it out and trips a fail.
Do what Rodney said and put in a chassis to body earth even if the light does not come back on again.
Dodgy earths cause all sorts of issues than just the sub tank faults in a Trol
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