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Topic: Oh you evil little ground connection (Read 440 times) previous topic - next topic

Oh you evil little ground connection

The scenario; Generator will start but will not run. I traced it down to plenty of current to start side of fuel solenoid but no current to run coil in solenoid. Ran out of knowledge and got the kid across the street for help. ( he's only 40 ). He is the lead electrician at a plant in Oakdale that builds fire engines. We check the relays, we check everything. No luck. Then he says, "the sensors operate on when they are triggered they break the ground, and therefore the circuit and generator stops running." We pull all the connections clean them good and hook everything back up. Test fire.....SUCCESS. Just like it came off the floor in Nagadoches. I was all set to order a new control board tomorrow, and install it. Maybe a coach buck saved.

Total cost of the fix      4 shots of my best Tequila ( 2 each ) and a couple of beers to wash them down.

Moral of the story here is as others on this forum have said, your ground system is CRITICAL to the health of your electrical system. Corrosion is an insidious unseen beast that can get you. You Newbies with older coaches like mine take heed. If you get an electrical gremlin make sure the ground is good! 
The Starship- 1990 Grandvilla Unihome U300 40ft
6V92 Detroit Diesel w/ 4 spd Allison w/ retarder. Build# 3575 , Foretravel# 17895
The Shuttlecraft- 2015 Ford Explorer
Steve ( N6EKV ) & Lori ( N6JTD ) Faries  w/ Marlee our precious pup.
Patterson CA.

Re: Oh you evil little ground connection

Reply #1
Hush your going to destroy a multi million dollar parts swapping industry. Motors and other stuff moves and twists sometimes breaking the ground path. Hey as one service manager told me "we don't make no money on labor"
Old Phart Phred, EIEIO
89 GV ored 36' #3405 300 hp cat 3208 ATAAC side radiator, mountain tamer exhaust brake

Re: Oh you evil little ground connection

Reply #2
We can all find Fault with our coach but most of the time it's the lack of a good ground.
1995 U320 40', 2013 chevy sonic toad, my real love are corvettes have owned 30

Re: Oh you evil little ground connection

Reply #3
With 12V systems I always begin with "It's always the battery."  Once that out of the way "It's always the ground."  Now my partner is a degreed electronics engineer, with an intuitive grasp of the goings and comings of electrons.  Me.?  I know enough about electronics to be dangerous, but give me a tool room's machine tools to work with, step aside and watch.

So as a learning moment, Lynn made me repair out generator myself.

Here's the write up.  I Repaired Our Onan Generator's Electronics! | arts-attic.com
1992 Foretravel Grand Villa
U225 SBID Build No. 4134
1986 Rockwood Driftwood
1968 S.I.A.T.A. Spring
1962 Studebaker Lark
1986 Honda VF700C
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AA1OH (H)e who must be obeyed.