Speedometer Circuit Board

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diesel freak
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Location: Charlotte, N.C.

Speedometer Circuit Board

Post by diesel freak »

My 1986 Golf Diesel speedometer and clock that work fine but my instrument lights do not come on. I tore the plastic or mylar circuit board when I replaced my speedometer. Any one have an old plastic circuit board that runs a speedometer and analog clock?
Fatmobile
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Location: north central Iowa

Re: Speedometer Circuit Board

Post by Fatmobile »

I wonder if a gasser plastic circuit board would work?
'91 Golf gasser converted to a 12mm pump, M-TDI.
'84 1.6TD Rabbit with a VNT-15 turbo, still setup to run on vegetable oil.
'84 GTI with 1.7TD pistons and intercooled.
2003 TDI wagon
2000 TDI Jetta.
diesel freak
Diesel Freak
Posts: 180
Joined: Sun Sep 03, 2006 12:56 pm
Location: Charlotte, N.C.

Re: Speedometer Circuit Board

Post by diesel freak »

If it has a clock instead of a tach it should work.
Fatmobile
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Re: Speedometer Circuit Board

Post by Fatmobile »

On the MK1s it's the same circuit if it's a GTI with a tach as the NA diesel with a clock.
I forgot to check my stash of MK2 clusters/circuits.
'91 Golf gasser converted to a 12mm pump, M-TDI.
'84 1.6TD Rabbit with a VNT-15 turbo, still setup to run on vegetable oil.
'84 GTI with 1.7TD pistons and intercooled.
2003 TDI wagon
2000 TDI Jetta.
30dodgeboy
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Location: SE Wisconsin

Re: Speedometer Circuit Board

Post by 30dodgeboy »

if you can solder, you can repair the printed circuit using small gauge wire to bridge the tear in the printed circuit. Just scrape off the outer layer of plastic insulation to expose the copper printed circuit, and solder the bridging wire to it. Once done, clean off the repair and cover it with a thin film of dielectric grease to prevent corrosion. Done it myself on an old chevy truck when the owner didn't have any spare parts for it.
diesel freak
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Posts: 180
Joined: Sun Sep 03, 2006 12:56 pm
Location: Charlotte, N.C.

Re: Speedometer Circuit Board

Post by diesel freak »

Can you suggest any specialist that would be capable of such surgery? Would I need a special solder if I attempt it myself?
Fatmobile
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Re: Speedometer Circuit Board

Post by Fatmobile »

I think there are special solders that flow at a lower temp,.. maybe silver solder?
I found a bunch of MK2 gasser clusters but forgot to take a pic.
None of them had a clock or glow plug light.
All my MK2 diesel ones have tachs.
'91 Golf gasser converted to a 12mm pump, M-TDI.
'84 1.6TD Rabbit with a VNT-15 turbo, still setup to run on vegetable oil.
'84 GTI with 1.7TD pistons and intercooled.
2003 TDI wagon
2000 TDI Jetta.
30dodgeboy
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Posts: 53
Joined: Wed Mar 11, 2015 9:54 am
Location: SE Wisconsin

Re: Speedometer Circuit Board

Post by 30dodgeboy »

silver solder flows at higher temps than tin-lead solders
bscutt
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Re: Speedometer Circuit Board

Post by bscutt »

there are conductive epoxies for circuit repair too, not sure how good the conductivity is but worth checking around on the internet. We used to use indium solder on some of our electronic assemblies where we have similar temperature issues but I don't recall if that was higher or lower temp solder. I have soldered to flex circuit too and it takes a very careful touch to avoid damaging the flex material. Narrow tip with good heat range on the tip (600-700 F or so) and a quick touch might work. You might also find something instructional on youtube on this kind of repair. Maybe search for flex circuit repair.
Bob

'06 Jetta TDI
'82 Rabbit 1.6NA
Honda, 99 GMC Suburban, '41 Chevy Coupe
30dodgeboy
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Location: SE Wisconsin

Re: Speedometer Circuit Board

Post by 30dodgeboy »

bscutt wrote: it takes a very careful touch to avoid damaging the flex material. Narrow tip with good heat range on the tip (600-700 F or so) and a quick touch might work.
thats exactly how I did it
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