Tacho power issue?
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Hi all, I have a RVI smiths with a Syida circuit inside due to an aldon in the dizzy. Issue will only work when side lights or indicator etc is on? I have tried three different earths, power direct from ignition. Was working fine a while ago, any ideas?
White +2s, S4 in bits & the practical Honda!
- therolfie
- First Gear
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Or maybe the body of the Tacho needs an earth. The earth is fitted to one of the threaded studs holding the Tacho in the dash.
I think the Tacho is back earthing through the light circuit.
Alan
I think the Tacho is back earthing through the light circuit.
Alan
Alan.b Brittany 1972 elan sprint fhc Lagoon Blue 0460E
- alan.barker
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Just had mine out for RVC to RVI conversion...
On my +2 (S130/5) power is via green switched wire and same wire goes on to power supplies alternator warning lamp than earths via alternator. Not sure what car your is and if it has the same wiring but are your warning lamps working.
On mine there are two earth connections, one spade to the rear of the tacho and one wire on the threaded stud.I think the stud one is earth for the full bean light. Does full beam on/off effect the behavior?
On my +2 (S130/5) power is via green switched wire and same wire goes on to power supplies alternator warning lamp than earths via alternator. Not sure what car your is and if it has the same wiring but are your warning lamps working.
On mine there are two earth connections, one spade to the rear of the tacho and one wire on the threaded stud.I think the stud one is earth for the full bean light. Does full beam on/off effect the behavior?
'73 +2 130/5 RHD, now on the road and very slowly rolling though a "restoration"
- mbell
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Thanks for the replies I have now solved I think, I have found a very old looking green tube connected between voltage stabiliser and the ignition loop wire. It says on it "auto radio fit kit" it could be a suppressor? Old school style? Any way I've taken this out & seems to be working & all other dials are good? Wish I had the knowledge to post pics!
Thanks
Thanks
White +2s, S4 in bits & the practical Honda!
- therolfie
- First Gear
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To upload photos, see the forum Tutorial. The maximum file size used to be 768kb, not sure if this has changed.
Link to Tutorial:- questions-f20/tutorial-how-upload-photos-t27816.html
Link to Tutorial:- questions-f20/tutorial-how-upload-photos-t27816.html
Trevor
1968 Elan +2 50/0173
1968 Elan +2 50/0173
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TeeJay - Fourth Gear
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Ok update, I have removed all other power take offs from the coil e.g. Fuel pump. Still nothing unless a window is used or the fan on full. I have test 12v at the tacho with engine running & have tested signal wire & earth for continuity. I have tried power direct from the battery. I have also tested on the bench & nothing? So will drop the circuit board company an email. Cheers
White +2s, S4 in bits & the practical Honda!
- therolfie
- First Gear
- Posts: 47
- Joined: 08 May 2013
This has just rung a bell.
When I fitted new Spiyda card to my tachometer it initially only worked as the engine first started and then returned to zero.
The cure was to put a resistor in series with the signal wire from the coil to reduce the signal produced by the electronic ignition which was overcoming the Spiyda electronics
The electric window load is quite high and may be causing a slight reduction in signal strength causing the tachometer to start working if so you should get the same response if you switch al the lights on etc.
I put an adjustable resistor (100k) in series and adjusted it until the tachometer worked .
Spiyda were very helpful - I think that on later versions a resistor was included along with a filter to stop interference from elsewhere on the car.
Ed
When I fitted new Spiyda card to my tachometer it initially only worked as the engine first started and then returned to zero.
The cure was to put a resistor in series with the signal wire from the coil to reduce the signal produced by the electronic ignition which was overcoming the Spiyda electronics
The electric window load is quite high and may be causing a slight reduction in signal strength causing the tachometer to start working if so you should get the same response if you switch al the lights on etc.
I put an adjustable resistor (100k) in series and adjusted it until the tachometer worked .
Spiyda were very helpful - I think that on later versions a resistor was included along with a filter to stop interference from elsewhere on the car.
Ed
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EPA - Second Gear
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