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  #1  
Old April 25th, 2013, 02:14 PM
Jerome
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Ground locations behind dash?

Hi all, first post here. I have a 1987 110 in my shop, and have been working on a bunch of different electrical issues, as well as installing new lights, trailer plug, etc. right now I believe I have a bad ground coming off of the rear defroster solenoid, specifically on the black/pink wire. [U]Does anybody know where this ground connection terminates[/U]? it looks to go into the main harness behind the dash. Is my only option to pull the dash apart and trace it? my manual's wiring diagrams seem mostly useless.
thanks
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  #2  
Old April 25th, 2013, 02:23 PM
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It is not one of the ones on the engine side of the bulkhead?
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Old April 25th, 2013, 02:26 PM
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You should find the main harness does ground on the engine side of the B/H, usually a bolt thru the B/H just inboard of the clutch peddle box. In my rebuild of B777 ONR I have added a ground wire from that point to the chassis.

You should not find any grounds behind the dash, even the fuse & relay panel has a ground wire to the main harness, at least on the older LD's
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  #4  
Old April 25th, 2013, 02:27 PM
Jerome
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Well, there isn't a similar wire terminating there, I suppose it could be, but since it tests as open with my multimeter I don't know of another way to tell besides tracing it. I was hoping someone would know if there's a hidden ground location behind the dash.

------ Follow up post added April 25th, 2013 01:30 PM ------

Thank you Roverman2010, so tearing the dash apart probably isnt going to reveal my problem then. I'll investigate further and post if I find the problem.
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Old April 25th, 2013, 03:03 PM
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Only ground I know of (NAS) on the inside of the bulkhead is the wiper motor. You sure your rear defrost is factory?
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Old April 25th, 2013, 03:32 PM
Jerome
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So, here is what I've found in the last hour or so of tinkering. It appears my wiring diagram for a rear defrost system does match up with what I've got in there, so not completely useless. There is power to the switch with ignition on, and when you flip the switch there b+ coming out to both white/green wires, one of which illuminates the dash light, and the other goes to the coil part of the relay. Also the relay has power coming into it from the large brown wire (labeled N in the diagram). what I cant find is where the black/pink coming out of the relay goes, this wire should provide ground in order to switch the relay on allowing power to flow through to the large brown/white wire and back to my rear window, according to the diagram that black pink is supposed to have a diode in it, and then it goes to component #1 which is called a "voltage sensitive switch". I cant find either the diode or the voltage sensitive switch. what I do know is when I ground the black pink coming on the back of the relay, it clicks and power flows to the rear defrost. So anybody know where the diode and voltage sensitive switch are?
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  #7  
Old April 25th, 2013, 04:01 PM
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that diode in the drawing is if not mistaken is part of the reply? protects relays father up from damage.

voltage conditioner should on the B/H or side panel behind the dash panel, fits into a four finger bracket or did
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