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Tach/Ignition problem

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farqs29 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote farqs29 Quote  Post ReplyReply Direct Link To This Post Topic: Tach/Ignition problem
    Posted: 25-May-2020 at 5:47AM
Hi everyone-

I just hooked up a vintage sun super tach to my 69 428 and got in to start it and the car won't start.  It turns over but seems like there's no spark?  I ran green wire to coil, white to ground, red to power and black to lights.  When I disconnect the coil wire, the car starts up and runs fine.  It shouldn't be an issue with the tach as it was recently rebuilt.  Any thoughts on what the issue might be, and how to fix it, would be greatly appreciated! Thank you in advance!
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farqs29 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote farqs29 Quote  Post ReplyReply Direct Link To This Post Posted: 25-May-2020 at 5:52AM
One more thing - the car has a mallory unilite distributor and a mallory promaster coil.  Not sure if this matters, but thought I'd mention it.  I will eventually bring it back to original coil and distributor but haven't gotten there yet.
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californiajohnny View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote californiajohnny Quote  Post ReplyReply Direct Link To This Post Posted: 25-May-2020 at 6:40AM
do you have a diagram for the wiring? idk sounds like a wire or 2 are wrong.
 green generally goes to the coil (- i think? ) are you sure wht is ground? and blk is the light?
JOHN
74 GRAN TORINO S&H CLONE
74 VETTE CUSTOM
90 S10 BLAZER 4X4 LIFTED
77 CELICA CUSTOM
75 V8 MONZA SUPERCHARGED
79 COURIER VERT. SLAMMED
75 VEGA V6 5 SPD
70 CHEV C10 P/U
68 MUSTANG FB CONVERSION
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Post Options Post Options   Thanks (0) Thanks(0)   Quote californiajohnny Quote  Post ReplyReply Direct Link To This Post Posted: 25-May-2020 at 7:09AM
ok i found this...
blk= ground
red= power
green= neg side of the coil
 wht= light
 which sounds correct from my memory as well

https://itstillruns.com/wire-sunpro-tach-7962668.html

JOHN
74 GRAN TORINO S&H CLONE
74 VETTE CUSTOM
90 S10 BLAZER 4X4 LIFTED
77 CELICA CUSTOM
75 V8 MONZA SUPERCHARGED
79 COURIER VERT. SLAMMED
75 VEGA V6 5 SPD
70 CHEV C10 P/U
68 MUSTANG FB CONVERSION
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Rockatansky View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rockatansky Quote  Post ReplyReply Direct Link To This Post Posted: 25-May-2020 at 8:10AM
White is dash lights

Green is coil -

Red is ignition power

Black is ground
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Post Options Post Options   Thanks (0) Thanks(0)   Quote farqs29 Quote  Post ReplyReply Direct Link To This Post Posted: 25-May-2020 at 8:12AM
Thanks so much... I will give this a shot... I hooked black up to the lights as the black wire is the wire that comes from the light bulb in the tach.  I figured the white wire must be the ground.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rockatansky Quote  Post ReplyReply Direct Link To This Post Posted: 25-May-2020 at 8:21AM
what you see in front of you is more important than a diagram i found on the interweb

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Rockatansky View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rockatansky Quote  Post ReplyReply Direct Link To This Post Posted: 25-May-2020 at 8:27AM
here's another


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Post Options Post Options   Thanks (0) Thanks(0)   Quote farqs29 Quote  Post ReplyReply Direct Link To This Post Posted: 25-May-2020 at 10:49AM
Thanks guys. The diagram helped... I pulled the tach out of the housing and the white and green wires were crossed on the back of the tach.  I changed the wires and that solved the ignition problem, but the tach isn’t working!!
I ran the power off of the wire to the power antennae.  Just tested it and it’s hot when the ignition is on.  When I turn the ignition I see the tach reset at zero, but nothing afterwards.  Does this sound like an issue with the feed from coil or main power?  Thanks for the help. I definitely need it!!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 72FordGTS Quote  Post ReplyReply Direct Link To This Post Posted: 25-May-2020 at 12:26PM
Do you have the green wire connected to the negative coil terminal? The tach just reads how often the coil is discharging, so if your car runs there is no issue from the coil. It's got to be in the tach or your wiring to the tach.
Vince

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californiajohnny View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote californiajohnny Quote  Post ReplyReply Direct Link To This Post Posted: 25-May-2020 at 3:32PM
red should be powered with the key on! power antennae wires usually only power up with the radio onOuch or basically to the positive of the coil with the green trigger wire to the negative of the coil.
 and the coil needs the ground wire hooked to ground the trigger wire only senses the pulses it requires all 3 to work the light wire is optional...
JOHN
74 GRAN TORINO S&H CLONE
74 VETTE CUSTOM
90 S10 BLAZER 4X4 LIFTED
77 CELICA CUSTOM
75 V8 MONZA SUPERCHARGED
79 COURIER VERT. SLAMMED
75 VEGA V6 5 SPD
70 CHEV C10 P/U
68 MUSTANG FB CONVERSION
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Post Options Post Options   Thanks (0) Thanks(0)   Quote farqs29 Quote  Post ReplyReply Direct Link To This Post Posted: 26-May-2020 at 10:26AM
Thanks for the input guys.  Yeah, I have the green wire hooked up to the negative side of coil and the red wire (power antennae, has a manual control switch) is hot when the key is turned on... confused, I guess it could be an issue with the tach, although it shouldn't be as I just had it rebuilt.  Might have to call the folks that rebuilt it
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Post Options Post Options   Thanks (0) Thanks(0)   Quote californiajohnny Quote  Post ReplyReply Direct Link To This Post Posted: 26-May-2020 at 3:46PM
that's kinda what i'm thinking too
JOHN
74 GRAN TORINO S&H CLONE
74 VETTE CUSTOM
90 S10 BLAZER 4X4 LIFTED
77 CELICA CUSTOM
75 V8 MONZA SUPERCHARGED
79 COURIER VERT. SLAMMED
75 VEGA V6 5 SPD
70 CHEV C10 P/U
68 MUSTANG FB CONVERSION
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farqs29 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote farqs29 Quote  Post ReplyReply Direct Link To This Post Posted: 27-May-2020 at 12:48AM
Well looks like I figured it out... actually I can't really say that...  Last night I was frustrated and pulled the tach and disconnected all wires to the back of the tach individually, cleaned the nodes and then reconnected them in exactly the same way I had them connected.  Turned the key and it works!  No clue...  Thanks for the help fellas.  Very much appreciated!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote californiajohnny Quote  Post ReplyReply Direct Link To This Post Posted: 27-May-2020 at 3:29AM
Shocked
JOHN
74 GRAN TORINO S&H CLONE
74 VETTE CUSTOM
90 S10 BLAZER 4X4 LIFTED
77 CELICA CUSTOM
75 V8 MONZA SUPERCHARGED
79 COURIER VERT. SLAMMED
75 VEGA V6 5 SPD
70 CHEV C10 P/U
68 MUSTANG FB CONVERSION
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Steve M. View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Steve M. Quote  Post ReplyReply Direct Link To This Post Posted: 27-May-2020 at 12:34PM
It's called P.FM.  I got my first lesson with it. In the military. P.F.M. will cure several electrical issues.
Steve M.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rockatansky Quote  Post ReplyReply Direct Link To This Post Posted: 27-May-2020 at 3:44PM
Percussive  Censored  Maintenance?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote californiajohnny Quote  Post ReplyReply Direct Link To This Post Posted: 27-May-2020 at 5:02PM
Originally posted by Rockatansky Rockatansky wrote:

Percussive  Censored  Maintenance?
IDK i was thinking plan B....BFHLOL
JOHN
74 GRAN TORINO S&H CLONE
74 VETTE CUSTOM
90 S10 BLAZER 4X4 LIFTED
77 CELICA CUSTOM
75 V8 MONZA SUPERCHARGED
79 COURIER VERT. SLAMMED
75 VEGA V6 5 SPD
70 CHEV C10 P/U
68 MUSTANG FB CONVERSION
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