Hello, I'm new to this forum and appreciate any help. I have a 1989 Ford E350 Super Club Wagon with a 460ci and C6 transmission. I use this van primarily for pulling a 6x10 and traveling in a Christian Rock band. I am having electrical issues now and cant seem to solve them on my own. First of all the temp gauge is reading higher than it should. 195deg shows as overheating on the gauge. The oil temp gauge is showing pegged out to high. The fuel gauge is reading lower than normal and the voltage gauge is very sensitive (it bumps down when the AC kicks on). I have replaced the oil pressure sender, coolant temp sender and checked the connections with a voltmeter on the back of the instrument cluster and all gauges are working but still reading the same. It gets more interesting though. When I first start the vehicle the climate control fan, door buzzer, and windshield wipers wont turn on until I either put the van in gear, hit the steering wheel with the palm of my hand, or slam the door real hard. I've checked the ground wire and it goes from the battery then attaches with a clip to the fender well and then to the engine block. I've pulled the dash out and wiggled everything checking all visible ground wires and checked the firewall. I'm very frustrated and could use some help. Again I really appreciate it.
Thanks,
Dustin

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You have a connection very very loose somewhere under the dash, possibly centered around the ignition switch. The fact a bump or hard hand hit "solves" the problems supports this.

You might post this in the Electrical Systems forums too---more specialized help there maybe: Electrical Systems/Wiring - Ford Truck Enthusiasts Forums

Hope this helps!