If that switch were closed, the light would be on all the time, so that's not the source of his problem.

 

not true i blew both a front and rear line at once and the light would go off as normal then come back on a few seconds later

 

yea sorry lol there is a little nut sort of thing on the top of the popotioning valve wiht a brass comperssable sensor have some one put breaks on and push brass pin thing down it should center the valves shuttle sensor inside it