peter t Posted September 21, 2011 Share Posted September 21, 2011 Have searched the threads but don't seem to notice this same problem. My tacho works most days but now and then it stops working. It can start up while driving or just stop. Doesn't affect the motor. Start up and go and get the paper, Works. Jump in start up and it don't work, drive down the road a bit and it may start working or it may not. What to check? Thanks for any help. ??? Quote Link to comment Share on other sites More sharing options...
benny Posted September 21, 2011 Share Posted September 21, 2011 mine is the same peter... will be going over it in the next weeks so will let you know if i have any ideas!! Quote Link to comment Share on other sites More sharing options...
Moderators Zedman240® Posted September 21, 2011 Moderators Share Posted September 21, 2011 A guess would be within the tacho itself...poor connection? Quote Link to comment Share on other sites More sharing options...
peter t Posted September 21, 2011 Author Share Posted September 21, 2011 Thanks guys, I have a spare so will rig that up as described in another thread and see what happens. Let me know how you get on with yours Benny and I will do the same as soon as I figure it out. I saw some talk of a fuse. Is this inside the tacho or elswhere? Quote Link to comment Share on other sites More sharing options...
peter t Posted October 11, 2011 Author Share Posted October 11, 2011 Pulled it out and put it in. Don't mean to be rude but still have problem with both gauges. Checked all fuses and all OK. Might try a new ballast resister and see what happens. Quote Link to comment Share on other sites More sharing options...
gilltech Posted October 11, 2011 Share Posted October 11, 2011 My 260 tach was doing the same thing when I put the car into storage some years ago. I couldn't figure out what was causing it at the time, it seemed to be getting power OK, so I had a niggling suspicion that it was probably linked to the dizzy, as in whatever triggers the tach reading was causing a very irregular fault. Just an idea though. Quote Link to comment Share on other sites More sharing options...
BobsYourUncle Posted October 11, 2011 Share Posted October 11, 2011 Peter, is your tacho a 3-wire (inductive) or 4-wire? My 74 2+2 had the 3-wire type, and it never worked. I tried a spare, and it didn't work either - I was under the impression the inductive type tachos didn't work too well with electronic injection? Quote Link to comment Share on other sites More sharing options...
peter t Posted October 14, 2011 Author Share Posted October 14, 2011 Quote Link to comment Share on other sites More sharing options...
peter t Posted October 14, 2011 Author Share Posted October 14, 2011 Peter, is your tacho a 3-wire (inductive) or 4-wire? My 74 2+2 had the 3-wire type, and it never worked. I tried a spare, and it didn't work either - I was under the impression the inductive type tachos didn't work too well with electronic injection? Not sure what you mean. Don't have injection. Played with the wires at the resistor and now it is going. Tomorrow may be different. Quote Link to comment Share on other sites More sharing options...
BobsYourUncle Posted October 14, 2011 Share Posted October 14, 2011 Oops, I meant electronic ignition. My bad... Quote Link to comment Share on other sites More sharing options...
peter t Posted October 19, 2011 Author Share Posted October 19, 2011 mine is the same peter... will be going over it in the next weeks so will let you know if i have any ideas!! Wacked a new connector on the green/white wire that goes on the basalt resistor and seems to have fixed it. Quote Link to comment Share on other sites More sharing options...
peter t Posted October 20, 2011 Author Share Posted October 20, 2011 @@@@@@@@ It has stopped working again. :'( Quote Link to comment Share on other sites More sharing options...
wildy55 Posted October 20, 2011 Share Posted October 20, 2011 Hey there Can't answer your problem (sorry) but maybe you can answer mine. Pulled everything off the inner wings to spray and have everything back and working apart from the tacho. Was working fine before. It's the connections around the coil I want to check. I put an electronic module on for the ignition, so did away with the balast resistor. Do I need that to make the tacho work? So far I've worked out that the b/w wire should go to the + terminal of the coil (is this correct?). I've tired that but no luck. Can you tell me what wires you have coming from the terminals on the coil please? Cheers Quote Link to comment Share on other sites More sharing options...
pauly_adams Posted October 21, 2011 Share Posted October 21, 2011 it must be an epidemic mine keeps working then stopping all week, it has happend to me before so i pulled it appart and cleaned it but it still would not work then one day it just started working again so its got me stumped. wildy i went out to have a look at my setup but i cant help i have replaced that side of the wiring in my car cheers pauly Quote Link to comment Share on other sites More sharing options...
peter t Posted October 21, 2011 Author Share Posted October 21, 2011 Hey there Can't answer your problem (sorry) but maybe you can answer mine. Pulled everything off the inner wings to spray and have everything back and working apart from the tacho. Was working fine before. It's the connections around the coil I want to check. I put an electronic module on for the ignition, so did away with the balast resistor. Do I need that to make the tacho work? So far I've worked out that the b/w wire should go to the + terminal of the coil (is this correct?). I've tired that but no luck. Can you tell me what wires you have coming from the terminals on the coil please? Cheers Will have a look for you in the morning and let you know. Quote Link to comment Share on other sites More sharing options...
peter t Posted October 21, 2011 Author Share Posted October 21, 2011 Hey there Can't answer your problem (sorry) but maybe you can answer mine. Pulled everything off the inner wings to spray and have everything back and working apart from the tacho. Was working fine before. It's the connections around the coil I want to check. I put an electronic module on for the ignition, so did away with the balast resistor. Do I need that to make the tacho work? So far I've worked out that the b/w wire should go to the + terminal of the coil (is this correct?). I've tired that but no luck. Can you tell me what wires you have coming from the terminals on the coil please? Cheers PM sent. Quote Link to comment Share on other sites More sharing options...
wildy55 Posted October 24, 2011 Share Posted October 24, 2011 Thanks for looking for me, Peter. Got no joy with it at the mo so have tried all combinations. All but one resulted in no movement of the tacho's needle, but one combo has the needle jump slightly on cranking but then motionless when the engine's running. Any of you clever fellas know why and where to from here? Cheers Martin Quote Link to comment Share on other sites More sharing options...
BobsYourUncle Posted October 24, 2011 Share Posted October 24, 2011 All but one resulted in no movement of the tacho's needle, but one combo has the needle jump slightly on cranking but then motionless when the engine's running. That's how the tacho behaved on my 2+2. What sort of tacho do you have? Can you take a photo of the back of it? Can anyone confirm that the inductive loop pickup style tacho works with electronic ignition? Quote Link to comment Share on other sites More sharing options...
NZeder Posted October 24, 2011 Share Posted October 24, 2011 http://forums.hybridz.org/index.php/topic/101042-tachometer-jumps-when-ignition-is-turned-but-drops-back-to-zero-once-car-starts/page__p__947120__hl__%2B240z+%2Btach+%2Belectronic+%2Bignition__fromsearch__1#entry947120 I my self had a new tacho drive installed inside the stock housing so it is now setup like a modern tacho - however if that above post is correct it should be just a matter of installing a resistors - but what size and where? Who knows? I have not read this yet but it might help (just found the link) http://www.dinoplex.org/tachoconversion/ Quote Link to comment Share on other sites More sharing options...
Daedalus-Z Posted November 22, 2011 Share Posted November 22, 2011 Hi Guys, Not 100% sure without actually pulling it out again, but I reckon my 260 has a three wire tacho and it's no better or worse using an electronic ignition module (pertronix ignitor), still occasionally jumps up to 8k or falls down to zero. Obviously wouldn't work if you went to coil on plug or anything without the distributor, or so my somewhat vague understanding of the system leads me to believe. Probably some sort of dodgy connection somewhere, but I'm not really sure where... wiring diagram for the tach is pretty simple so may actually be an issue in the tachos themselves (they are pretty old and not exactly what you'd call 'solid state' devices). Quote Link to comment Share on other sites More sharing options...
zeds4ever Posted January 9, 2012 Share Posted January 9, 2012 When I installed my Elctrnc dissy in my motor I dscnctd the two wires that were cnctd to the resistor unit that was situated underneath the coil & joined them together. I then cnctd a wire from the "+" Trmnl on the dissy to the Module on the dissy marked "B". from the other trmnl on the module marked "C" I cnctd a wire which I then terminated on the "-" side of the coil. Might point out that I also fitted a stronger coil.The Tacho was the original three wire unit that was fitted in car. A 76/ 260Z S30, everything works fine. Hope this helps if you haven't already resolved the problem. By the way sometime back I posted a method for testing a Tacho out of the vehicle. Regards: Alan. Quote Link to comment Share on other sites More sharing options...
Ducer Posted February 1, 2012 Share Posted February 1, 2012 Im still having a hard time figuring how to make mine work..... I have an early 74' 260z and I've upgraded to the ZX (E12-80) dizzy. The car runs superb. But I've tried to get the tack working with absolutely no luck. My tach: 3 Wires: Black (ground), Green,Red/black (Bullet connector) Other wires for bulbs: Red/blue, Green/Red, Green/White, Green/Black Unused: 2 wires from 260z dizzy: Green/red, Green/white Coil +: Black/White and Black/Blue (which goes to ignition switch) Coil - : Goes to C on (e12-80) 12V ignition to: B of (e12-80) as well as to Black/white to Coil + Blue wire: (most likely the negative trigger?) ----------------------------------------------------------------------------------------------------- After reviewing the FSM, I see that : *GREEN from the tach is jumped and connects to Black/White somewhere in the circuit *Blue is suppose to go from Coil (-) to tach bullet connector But my issue is that my tach has (RED/BLACK) bullet connector, WTF??? I've traced all the wires, Green/red, Green/White, Blue, black/white all go into the Transistor I hear about putting a 2.2k Ohm resistor on the bullet on the tach, as well as get an "AMP" which came on the factory coil of the ZX to make it work. It's getting so complicated as it should be so easy. HELP ME. Quote Link to comment Share on other sites More sharing options...
zeds4ever Posted February 2, 2012 Share Posted February 2, 2012 When you you disconnected the two wires that were connected to the resistor situated immediately underneath the coil, did you join these together .As this could be your problem failing that check out the procedure I used for my set up which works A1. Regards: Alan. Quote Link to comment Share on other sites More sharing options...
peter t Posted October 22, 2013 Author Share Posted October 22, 2013 mine is the same peter... will be going over it in the next weeks so will let you know if i have any ideas!! Benny, did you ever get to the bottom of this problem? I didn't and still have the same issues. > Quote Link to comment Share on other sites More sharing options...
peter t Posted November 3, 2013 Author Share Posted November 3, 2013 OK I hooked a spare tacho up as per Alans instructions and Tacho works. Fit it into car and it doesn't work but car runs. Any ideas where to go from here? ??? ??? ??? Quote Link to comment Share on other sites More sharing options...
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