Tick toch help

[mccoymail]

Guys- looking for more help (again)

New OER Tick Tock Tach installed in the Charger with all new harnesses.

Accel super stock coil on the 440

Mopar electronic ignition

When I start the car, the tach works for literally 3 seconds then bottoms out. Clock works fine.

I have put a jumper directly from the negative coil post to the tach with the same results. Also did the same for the positive feed to the tach.

Any wizardry ideas?

Thanks

 

[super-bee_ski]

Isn't that how long the Resistor "drops" voltage to start the car?
Or: Correction: how long the Ballast resistor allows 12V to the starter?
(And then the voltage drops to 9V?)

 

[mccoymail]

I should have added that about a month ago, when I installed it, I had the car running for about 5 minutes and noticed no issues. Installed an exhaust recently and that is when it started this issue.

 

[oldbee]

Ski is kinda right but voltage drop is temp related, how long it takes resistor to heat up(cold weather longer ?) Ballast has nothing to do with starter circuit. Per my manual the ballast wire is going to "+" side of coil (1968),but I'm sure any yr is the same."-" side goes to distributor & gray with tracer to tach.

 

[oldbee]

Just an idea, the manual shows two plugs on engine side for the gray/tracer wire even though a single wire running to & thru firewall, maybe you bumped one and connection is not good?

 

[mccoymail]

Possibly oldbee, however I ran a separate single wire through the window directly from tach to coil with no change.

I have one wire from ballast to positive on coil
Negative on coilgoes to distributor and another for tach.

 

[oldbee]

Ur tach may just have bit the dust? Check all connections!! Mine once wouldn't start at gas station because most of the wire strands had broken at "-" coil eyelet. It's always exasperating. Let us know

 

[440+6]

Dose the tach have a good ground and power from blue wire?

 

[mccoymail]

Does have good power at blue wire. Will add another ground to see

 

[mccoymail]

Ground is good. Still works about 3-5 seconds. Then goes to zero

 

[kiwigtx]

Did the Tic-Toc-Tac come from PG Classic Restoration Parts?
If so, please refer to this thread below;
http://www.forbbodiesonly.com/moparforum/threads/chinese-made-seat-covers.113426/#post-910538791

If not, then suggest a re-check of all connections, and test continuity between tach and coil, as well as grounds and where the +12V is going to.

 

[mccoymail]

It came from s guy on this forum. Looks new and in an OER box.

 

[kiwigtx]

Carefully remove grey wire from the back of the tach, and check resistance to ground - there may be an intermittent short. Have an assistant (wearing a bikini would be nice) wiggle the grey wire at the firewall entry through the grommet while testing also.

OR - swap out the Accel super stock coil for a regular coil. I did have problems many years ago with one of those super coils - they put out one helluva voltage ....so it MAY be causing issues with a stock tach unit.


PS....pics of bikini clad assistant would be useful here.

 

[Lionized]

Carefully remove grey wire from the back of the tach, and check resistance to ground - there may be an intermittent short. Have an assistant (wearing a bikini would be nice) wiggle the grey wire at the firewall entry through the grommet while testing also.

OR - swap out the Accel super stock coil for a regular coil. I did have problems many years ago with one of those super coils - they put out one helluva voltage ....so it MAY be causing issues with a stock tach unit.


PS....pics of bikini clad assistant would be useful here.

My guess as well, try a different coil.
(Bikini clad assistance encouraged)