I have a Toyota 5FBE20, SN 10334, that will lose power to the pump contactor at times. It seems to happen after the hydraulics are used a few times. I have replaced the pump contactor twice, both times with aftermarket, and the problem went away for about a month after the first one, but less than a week after the second time.
When the problem occurs, the contactor will engage for a split second, then release. It will remain released if you hold the handle for the function you selected. Once you release the handle and select it again, it may work or may act up again. And when it is doing this, it does not matter what function is selected. Any ideas?