Hi, I am new to the forum and tried doing a search for a similar Thumb issue on a 307D but no luck. I am helping friend with his 307D Excavator he believes it is a 2008 the Product Identification Number is CAT0307DEDSG00184 The solenoids (part# 111-9916) that operate the auxiliary control valve under the floor board have 28 volts when the button on the right joy stick is pressed up or down. But after i plugged them in and check the voltage it dropped to 8v. We traced the wire numbers and it appears that it goes directly to the ECM on the back of the cab. Any insight, schematics and help on this issue is really appreciated .
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