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Author Topic: Tachometer failed  (Read 4939 times)

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GREENYORKIE

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Tachometer failed
« on: 08 March, 2014, 10:43:01 PM »
Can anyone suggest a reason for the sudden failure of a revcounter on a 1.8? My reading of the electrical schematic shows the signal comes from the coil,so a spare fitted and no joy.Fitting a spare instrument panel had the same result.Any pointers?
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Evo1 1992, Delta HPE HF 1998, Beta coupe 2000,1983.Audi TT. Delta HF Turbo,1988.

fay66

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Re: Tachometer failed
« Reply #1 on: 08 March, 2014, 11:09:36 PM »
Check out the instrument panel earth points as well as the main battery earth lead under the battery tray, Dedra's throw up all sorts of weird electrical faults if there's a bad earth, another thing they don't like is anything electrical being fitted that wasn't designed specifically for Dedra.
Brian
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Own 1966 Fulvia 2C Berlina since 1997, back on road 11-1999.Known as "Fay"
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fay66

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Re: Tachometer failed
« Reply #2 on: 08 March, 2014, 11:11:19 PM »
Quote from: fay66 on 08 March, 2014, 11:09:36 PM
Check out the instrument panel earth points as well as the main battery earth lead under the battery tray, the Dedra's throw up all sorts of weird electrical faults if there's a bad earth, another thing they don't like is anything electrical being fitted that wasn't designed specifically for Dedra.
So I assume other models may also react in a similar manner.
Brian
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Own 1966 Fulvia 2C Berlina since 1997, back on road 11-1999.Known as "Fay"
2006 Renault Megane 1 5 Dci Sports Tourer
Dedra Technical Adviser

GREENYORKIE

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Re: Tachometer failed
« Reply #3 on: 10 March, 2014, 09:29:02 PM »
Thanks for that Brian.What I have established is an a.c. voltage at the connector for the revcounter at the back of the instrument panel which changes as the revs change.All the other gauges and warning lights operate as normal which makes me suspect I don't have a general earthing problem but a specific earthing problem relative to the revcounter.My problem now is deciding where the earth for the revcounter is.Any advice?
David.
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Evo1 1992, Delta HPE HF 1998, Beta coupe 2000,1983.Audi TT. Delta HF Turbo,1988.

fay66

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Re: Tachometer failed
« Reply #4 on: 11 March, 2014, 12:48:59 PM »
Quote from: GREENYORKIE on 10 March, 2014, 09:29:02 PM
Thanks for that Brian.What I have established is an a.c. voltage at the connector for the revcounter at the back of the instrument panel which changes as the revs change.All the other gauges and warning lights operate as normal which makes me suspect I don't have a general earthing problem but a specific earthing problem relative to the revcounter.My problem now is deciding where the earth for the revcounter is.Any advice?
David.

Sorry I can't check as I've just sold my Delta HF Turbo Manual! but it's not normally very far from the cluster possibly near the door pillar.

Brian
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2006 Renault Megane 1 5 Dci Sports Tourer
Dedra Technical Adviser

lancialulu

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Re: Tachometer failed
« Reply #5 on: 11 March, 2014, 01:11:33 PM »
Quote from: fay66 on 11 March, 2014, 12:48:59 PM

Sorry I can't check as I've just sold my Delta HF Turbo Manual!

Brian
8227 8)


Blast was looking for one of those.....
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Its not the winning but taking part! or is it taking apart?
Lancias:
1955 Aurelia B12
1967 Fulvia 1.3HFR
1972 Fulvia 1600HF
1972 Fulvia Sport 1600
1983 HPE VX
1988 Delta 1.6GTie
1998 Zeta 21.  12v
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