|
|
Thread: tach no work
[' This thread is 2 pages long: (1)
2 '] |
tom93r1
Redlining
Posts: 458
|
posted September 11, 2009 04:42 PM |
|
tach no work
Suddenly my tach isn't working. I installed an AEM Twin Fire and that's the last it worked, it's still hooked up correctly to the trailing coil. Could the twin fire kill a tach? The fuel gauge works, so it isn't the fuse, I can bypass the AEM and the tach still doesn't work. I checked to make sure there was continuity from the coil through the connector into the main harness, haven't pulled the cluster to check at that point. Any other ideas before I decide I have to pull the cluster?
thanks!
|
|
dhood
Hauling
Posts: 134
|
|
posted September 11, 2009 09:51 PM |
|
|
May not be your problem but when my tach stopped, I just shotgun resoldered it. Been fine ever since the last ten years.
|
|
TimPA136
Redlining
Posts: 325
|
|
posted September 12, 2009 09:57 PM |
|
Tach
Hey Tom,
My ignition is stock but when I had tack problems it was a loose primary wire fit on the points. The terminal would snap on but then be loose. The tack ran off of one point. I am running both points all the time and didn't feel the cutting out if it were stock. It sounds like it is related to your last addition. How does the ignition work/feel otherwise?
|
|
tom93r1
Redlining
Posts: 458
|
|
posted September 16, 2009 09:15 AM |
|
I have electronic ignition and get trailing spark, the tach gets signal directly off the coil so I think everything should be good in the engine bay... unless I am not correctly understanding.
I hope I don't have to resolder the tach, I hate doing that kind of work
|
|
sparky
Redlining
Posts: 299
|
|
posted September 16, 2009 10:34 AM |
|
Anytime i had a tach failure was due to failed trailing ignitor on my DLDFIS ignition. Modified 1st gen rx-7 electronic ignition. Probably 3 times total over several years. Check for voltage at coil 12 VDC and use inductive timing light to trailing coil and verify spark. If no spark, then failed ignitor on distributor.
Good luck.
|
|
tom93r1
Redlining
Posts: 458
|
|
posted September 24, 2009 01:50 PM |
|
I get spark, so the whole ignition system is working. I haven't had time to pull the tach so looks like I will be tachless for 7stock this time.
____________
'74 lawn-green
4-port 13b
Weber 48DCO
Racing Beat Header
Magnaflow
resonator/amplifier
really loud!
|
|
tom93r1
Redlining
Posts: 458
|
posted December 28, 2014 12:50 PM |
 Edited By: tom93r1 on 28 Dec 2014 13:09 |
5 years later and my tach still isn't working. I finally decided today to tear into it and found a couple blown up resistors on the circuit board attached to the tach. Does anybody have a circuit diagram of the tach or have a good tach sitting out they could take a picture of that circuit board?
It's the big resistor that's coming in off the black wire and the smaller resister sitting right next to it. A measurement with an ohm meter would work, or even just posting what the color bands on the resistors are.
The smaller resistor may possibly be yellow-gray-black-silver, or 48ohm.
The big one is just all burnt up black.
thank you
|
|
mazdarx605
Redlining
Posts: 314
|
|
posted December 28, 2014 01:51 PM |
|
Does this help at all?
http://i1079.photobucket.com/albums/w519/Mazdax605/IMG_20141228_164246905_HDR_zps4ce16208.jpg
I can get you values if you need with my DVOM.
Chris
|
|
nwaco
Redlining
Posts: 407
|
|
posted December 28, 2014 08:03 PM |
|
|
Get in touch with me. I have a free replacement tach. K
|
|
tom93r1
Redlining
Posts: 458
|
|
posted December 29, 2014 07:43 AM |
|
Chris, that is exactly what I was looking for! Guess the red band on my little one was charred to look black and all the bands on what's left of the big one look black.
nwaco, thanks much for the offer! I will get in touch.
And thanks everybody for looking!
Tom
|
|
mazdarx605
Redlining
Posts: 314
|
|
posted December 30, 2014 03:46 AM |
|
|
Is it not an amazing world that we live in? I mean that how a guy in CA can post a message about a tiny component of his obscure truck,and a few hours later a guy in MA can take pictures with his phone amd post them to said person. Amazing times!!!
|
|
tom93r1
Redlining
Posts: 458
|
|
posted January 11, 2015 03:28 PM |
|
|
As of today I have a working tach! Only took 5+ years but it's finally done. Thanks for the help everybody and thanks for the parts nwaco!
|
|
TimPA136
Redlining
Posts: 325
|
|
posted January 11, 2015 03:50 PM |
|
good news
Reminds me of the song, "hey buddy? how do you get this car out of SECOND gear beep beep he-he
|
|
nwaco
Redlining
Posts: 407
|
|
posted January 11, 2015 09:37 PM |
|
|
It was truly my pleasure. Enjoy!
|
|
tom93r1
Redlining
Posts: 458
|
|
posted January 19, 2015 08:16 AM |
|
|
Guess tach still isn't quite perfect. It seems like I am getting some kind of feedback from the tach into the redline buzzer. At light throttle when cruising I get a faint buzz from it, but at full throttle or no throttle decel the buzz quits. I guess I could just disconnect the buzzer, but was hoping somebody had an idea of what might be the cause?
|
|
spokanerxdude
Hauling
Less cubes... More balls
Posts: 181
|
posted January 20, 2015 04:18 AM |
|
THAT'S IT!!!...HIT IT WITH A STICK SEVERAL TIMES!!!!
Sorry man wish I could help you with this. I'm sure when I get mine up and running I'll have the same kind of problem getting my Megasquirt to run the tach.
____________
Allen Ervin, spokanerxdude@yahoo.com
509-998-9024
|
|
tom93r1
Redlining
Posts: 458
|
|
posted January 21, 2015 08:27 AM |
|
|
I just might hit it with a stick if it doesn't shut up! I think I just need to verify that I have it connected to the correct terminal on the coil.
|
|
TimPA136
Redlining
Posts: 325
|
|
posted February 04, 2015 07:29 AM |
|
At light throttle when cruising I get a faint buzz from it, but at full throttle or no throttle decel the buzz quits.
It almost sounds like it is operating backwards, is there any chance you could reverse polarity at the tack?
Maybe a missing diode that blocks back feed?
Try pestering the ignition hotline for a cure for this.
Good luck.
Tim
|
|
| All times are PST (US)
[' This thread is 2 pages long: (1)
2 '] |
|
|
