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Message: <blockquote data-quote="wateka" data-source="post: 133077" data-attributes="member: 21519">Within the 853 model, there are several variations of that warning light getting triggered. On mine (a non-BOSS machine), if the charge pressure is low, or the filters are clogged, or the hydraulic fluid temperature is too hot, then that light will come on. The variations come to play with the type of pressure sensor that you may have (or should have). The BOSS machines have a charge pressure sensor that outputs ohms to feed the BOSS computer. My 853 is not a BOSS machine and had a charge pressure sender that sent out ohms. In following my wiring schematic and the jumble of wires that had been patched over the years there were two wires that went to my charge pressure sender, but only one was being used. It turns out that if my charge pressure switch needed to be a simple, 3-pole, NO and NC switch.  The NC side is wired to the tranny warning light, and the NO side is wired to the hour meter. If the charge pressure was less than 100psi, the NC side would stay closed and the tranny warning light would illuminate and NO side would stay open, meaning that the hour meter would not be ticking. If the charge pressure was >=100 psi, the NC side would open, and the warning light for charge pressure would turn off (assuming the temp and blocked filters are functioning normally) and the NO side would close and the hour meter would start ticking.That's just to help you figure out your possible charge pressure warning light issue.To see if it is the charge pressure, remove the other wires from the temp sensor and filters first to see if you can isolate the problem. You should review the electric schematic (it's not terribly friendly unless you have, or know someone who has, a EE degree).</blockquote>

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