never did it with us... had a very good battery program and a coupla things (big fuel pump, tunes and such) that would pull a few amps almost all tha time tha key was on
justa note.. most metal reading marine temp gauges are not very accurate.. best to rely on tha over temp alarm and water pressure gauge.. you need ta use a temp gun to determine jus how accurate tha gauge is.. ya may be one of tha lucky ones!
that may be tha gauge wire.. most harness's had a spare tan for tha gauge that had a bullet connector on it.. if continuity checks from end ta end jus use it for tha gauge...
over temp should be a tan/blue.... in tha early days merc did some confusing things with tha tan and tan/blue.. at one time they were both tan (very early on) till they added tha blue tracer to tha alarm wire....
since that one looks like it reads actual water temp... it should be just one wire.. sensor grounds to tha block.. alarm should be one wire also.. my old age is settin' in!
must be an older merc with two piece heads..
