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Old 10-01-2008, 08:09 PM   #1
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Maintenance Questions

I was crawling around under my van today looking for any and all zerk fittings that need to be lubricated.
'08 E350 Diesel with SMB 4x4.
I found a total of 3. One on the rear drive line, one on each side of the steering linkage. Anyone else find more hidden away somewhere?

I found a switch that I have no idea what it controls. See picture below.
You are looking at the passenger side frame rail just in front of the forward starting battery. Its hard to see since everything is black, but there is a small 2: x 2: x 1/2" thick device with a red push button switch. If I push the button a little lever moves and looks like it opens a circuit. Anyone know what it is? (John K???)

Also right next to it is a strap that looks like a ground strap. The connection on the frame rail is tight, The connection on the battery case is loose and looks like it was intended to be. There are two straps like this on each of the starting battery cases. All with a tight connection to the frame rail and a loose connection to the case. Anyone want to educate me on this?

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Old 10-01-2008, 08:15 PM   #2
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That strap is not a ground. When you remove the battery tray to service the battery, the tray hangs on those cables. There is an identical one on the other side, and two more if you have a second battery there (some later Diesels).

The switch I have no idea. Some kind of battery interrupt maybe, you'll have to look at the wiring that goes through it probably. The silver thing to the right looks like your starter solenoid, so if the switch goes to it, it is probably a starter interrupt... a little low brow anti theft or for long term storage disconnect.
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Old 10-01-2008, 08:24 PM   #3
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The switch is a large amp circuit breaker.

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Old 10-01-2008, 10:44 PM   #4
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The black device is a circuit breaker for the ExremeAir compressor. The red push button is to test it, and the red lever is used for resetting it. An 80 amp circuit breaker is used for the standard ExtremeAir, a 100 amp circuit breaker is used for the Magnum ExtremeAir.

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