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08-24-2006, 03:21 PM
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#1 |
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Registered User
Join Date: Aug 2006
Location: Texas
Posts: 29
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Printed Circuit Board
I just replaced the printed circuit board on my 70 Custom 10. Half the dash lights were not working, but all gauges worked fine. Now that I have replaced the circuit board, all of the dash lights work fine, but the brake light (on bottom left side of fuel gauge) works some times and others not. Also, the tachometer works OK if headlights are off but when I turn headlights on, the tach revs up to 4500 rpm and works backwards. When I accelerate, it goes down to 3000 rpm as if it was wired up backwards. This only happens when the headlights are turned on. Any ideas what might be the problem?
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08-24-2006, 06:31 PM
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#2 |
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Senior Member
Join Date: Dec 2004
Location: Southern Pines NC
Posts: 3,853
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Re: Printed Circuit Board
sounds like ground problems
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08-24-2006, 06:48 PM
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#3 |
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Registered User
Join Date: Aug 2006
Location: Texas
Posts: 29
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Re: Printed Circuit Board
Thanks. Any idea what I need to check? I don't remember disconnecting any grounds when I pulled the dash out to replace the circuit board.
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08-24-2006, 10:18 PM
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#4 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,690
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Re: Printed Circuit Board
Did you post the same thing somewhere else? I coulda sworn I responded to this already.
I would start by adding a bround from the dash, to the 'tin' in the back of the inst panel. Just a section of wire with eyelets on the ends will do. |
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08-26-2006, 11:10 PM
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#5 |
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Registered User
Join Date: Aug 2006
Location: Texas
Posts: 29
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Re: Printed Circuit Board
Thanks. I think there were two posts out there, but one must have been erased. What do you mean by tin? Do I need to connect the ground wire from the dash to one of the screws holding the circuit board to the gauges?
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08-27-2006, 12:33 AM
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#6 | |||
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Union Electrician
Join Date: Feb 2005
Location: Louisville, Ky.
Posts: 3,354
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Re: Printed Circuit Board
No you need to connect the ground wire to one of the 8 mounting screws that holds the tin and the plastic bezel together.
__________________
 69 Custom-10 SWB FLEETSIDE  350/350 TH Dropped 3.5/5.5"Help support the board->HERE Board vendors -> Vendors list Zip:40272 Big Sandy Survivor... Quote:
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08-27-2006, 02:47 PM
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#7 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,690
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Re: Printed Circuit Board
as long as it is bolted to the metal backing, it won't matter where. Personally, I like putting it where the printed circuit board bolts on and grounds to the tin.
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