I noticed my front tires aren't spinning after testing by jacking up the rear end only and switch to awd putting it in Low and only the rear tires spin. So I am trying to test voltage first to the front diff. I disconnected the plug going to the front diff and am testing on the vehicle side of the connector. My question is when checking voltage do you go across the two leads on the connector going into the front diff (one br/wh wire and one rd/dg) or do you put one lead on a chassis ground and the other on the red/dark green wire? When I test it with the meter on the negative battery post and positive one the rd/dg wire I get 12 volts with the awd switch engaged. But if I go across those two connector pins I get no voltage with the awd switch engaged. Seems I would need to go across the two pins since the ECM is what sends a ground signal to Engage the front diff and there would always be 12 volts there if i go to a chassis ground but I'm not sure. I did ohm out the coil and got 24 ohms which is good.
Here is what the manual says as far as testing but it is not clear if you go across the two pins or use a chassis ground.
Turn the ignition switch and AWD switch on and place gear selector in High or Low gear. Check for minimum battery voltage at Gray and Brown/White chassis wires that power the coil. A minimum of 11 Vdc should be present.
3.If electrical tests are within specification, remove gearcase (see “Gearcase Removal”) and inspect components.
Here is what the manual says as far as testing but it is not clear if you go across the two pins or use a chassis ground.
Turn the ignition switch and AWD switch on and place gear selector in High or Low gear. Check for minimum battery voltage at Gray and Brown/White chassis wires that power the coil. A minimum of 11 Vdc should be present.
3.If electrical tests are within specification, remove gearcase (see “Gearcase Removal”) and inspect components.