Folks, old style tach, series 1, has no marking on back where + wire goes, does it matter?, I
do not want to screw it up, I will run new wires from generator a/c back to this unit. Thanks. Mike.
p.s. included pic of tach and an old pic of how my restore is going.
tach wire generator wire placement? (pic included)
#2 Re: tach wire generator wire placement? (pic included)
It's AC...not polarity sensitive...
Julian the E-type man
1962 FHC
1966 MGB....fab little car too
1962 FHC
1966 MGB....fab little car too
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#3 Re: tach wire generator wire placement? (pic included)
The S1's used a tach generator driven off the rear of the RH camshaft. This outputs 1v per 100rpm and the tachometer responds to the total voltage, so basically a voltmeter. It is entirely independent of the ignition system, unlike the S2 cars. About the only thing you may notice is the rev counter under-reading which is caused by the magnets in the generator weakening with age. No fix other than replacing the generator and the repro items are prone to early failure so look for a good s/h one off a Mk2, Mk10 or E-Type.
David Jones
S1 OTS OSB; S1 FHC ODB
1997 Porsche 911 Guards Red
Add your E-Type to our World Map: http://forum.etypeuk.com/viewtopic.php?f=1&t=1810
S1 OTS OSB; S1 FHC ODB
1997 Porsche 911 Guards Red
Add your E-Type to our World Map: http://forum.etypeuk.com/viewtopic.php?f=1&t=1810
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#4 Re: tach wire generator wire placement? (pic included)
There is a fix for under reading AC tachs-and that is to send it off (to Mike Eck in the US-see the US JagLovers Forum) to be modified to use the tach generator signal as a pulse input. The mod is an internal circuit board, and requires a switched +12v wire to be added. Not other wiring mods, so it appears stock. Found my tach was reading about 800 rpm low before having it updated.
Steve
'65 S1 4.2 FHC (early)
'65 S1 4.2 FHC (early)
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