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Author Topic: Ok, here is a weird one....  (Read 691 times)

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Offline Amc1320

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Ok, here is a weird one....
« on: February 22, 2013, 10:44:58 PM »
A little background for the experts

Rebuilt engine
All the vacuum hoses removed, exept for PVC, 4wd and vac advance
hei one wire dist

So, hooking my tach bask up, connected the wire from the tach place on the dist to the green wire on the harness

Tach works, sorta, BUT

Only when turn signals are blinking, each time the signals flash it jumps to the correct rpms then back to zero

Also I have power windows, so if you roll up the window but continue to press the switch after the window is all the way up the tach works great perfect, until you stop trying to "over" roll up the window!

What the......

Everything else electrical works fine

So if i want to know my rpms I just have to turn?

Thanks
Rob
Rob c
84 Eagle Limited
78 AMX
81 Spirit
Manchester, TN

Offline eaglebeek

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Re: Ok, here is a weird one....
« Reply #1 on: February 22, 2013, 10:51:16 PM »
Check for ground for your tach... :eagle:
1984 Eagle Wagon, 258, auto, 2.73 gears, daily driver
1983 Eagle Limited Wagon, new arrival from way up north
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Offline ammachine390

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Re: Ok, here is a weird one....
« Reply #2 on: February 22, 2013, 11:09:52 PM »
Is this a stock tach or an aftermarket? Stock tachs ground through the negative post of the ignition coil. If it's aftermarket and has a separate ground wire and the trigger wire to the negative of the ignition coil, then I agree with eaglebeek, check the grounds.
Dan
1981 AMC Concord DL 258 Auto

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Offline Amc1320

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Re: Ok, here is a weird one....
« Reply #3 on: February 22, 2013, 11:13:50 PM »
It's the stock tach, I agree it's a ground somewhere, i don't think it's in the dash must be under the hood somewhere, after all it was all removed and replaced, musta missed one somewhere

It's just weird that's it related to the turn signals

Rob c
84 Eagle Limited
78 AMX
81 Spirit
Manchester, TN

Offline vangremlin

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Re: Ok, here is a weird one....
« Reply #4 on: February 23, 2013, 08:05:28 AM »
The stock tach grounds through the upper left mounting screw where it attaches to the instrument cluster, and it looks like it shares a common ground with the turn signals and various other lights on the cluster.  Here is a picture of the back of the cluster, the ribbon on the printed circuit board goes to about the 9:00 position on the round connector.  Please don't mind the slippers  :rotfl:

PS that box in the background is your hood trim waiting to be shipped today Amc1320.

1981 Kammback 258 - "Pepe"
1972 Gremlin X 304
1978 Gremlin 4 cyl 121 - sold
1964 TBird 390

Offline rollguy

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Re: Ok, here is a weird one....
« Reply #5 on: February 23, 2013, 11:25:24 AM »
Cool slippers! (disregard that, you said not to mind the slippers).
1980 Eagle Turbodiesel Wagon (only 2 known to exist as of 2008)- 7-7-2011 Flight to it's new nest @ Rambler Ranch
1983 Eagle Wagon  Tan over Copper
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Offline eagleman

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Re: Ok, here is a weird one....
« Reply #6 on: February 23, 2013, 11:44:03 AM »
Wish I had a pair of blue slippers like those! You said pay no attention to the slippers but I just had to respond there so  well you know, cool. yeah thats it cool.lol
Turkeys walk.Eagles fly!!!

Offline vangremlin

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Re: Ok, here is a weird one....
« Reply #7 on: February 23, 2013, 02:16:54 PM »
Thanks, and those slippers rock by the way.  I don't think they make that particular style anymore thoush, so I'm trying to keep them going....kind of like our Eagles.
1981 Kammback 258 - "Pepe"
1972 Gremlin X 304
1978 Gremlin 4 cyl 121 - sold
1964 TBird 390

Offline Amc1320

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Re: Ok, here is a weird one....
« Reply #8 on: February 23, 2013, 04:55:59 PM »
Ok, heres some further investigation

THe tach works fine with the headlights OFF, does not work when the lights are on??

huh?
Rob c
84 Eagle Limited
78 AMX
81 Spirit
Manchester, TN

Offline carnuck

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Re: Ok, here is a weird one....
« Reply #9 on: February 23, 2013, 05:12:10 PM »
Try jumper cables from the battery negative to something clean metal (possibly bumper face) with the lights on and see if it works. That would be missing/broken/corroded body to battery negative strap. Headlights will also get brighter and battery will get fuller.
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