67 issues

[Jeremy H.]

We are finishing up a frame off on this 67 and we are having some issues. All new wiring 435hp car with TI. No spark. How many volts should their be to the + on coil with key on? How about when you crank it? I have used 2 new TI amps with no luck. Coil was new as well. Even tried a coil we took off of a running car just a few months ago. How can I rule in or out if it is the amp or coil? Needs some help.

Thanks

Jeremy Hedges
#31711

[Michael M.]

Re: 67 issues

This is not my area of expertise, but have you verified 12 volts at the coil with key on. I would think that either the coil or amplifier needs a 12 volt source.

[Jeremy H.]

Re: 67 issues

I am getting 3.35v with key on and 4.35v cranking it. Souldn't I have 12v at the + on coil with it cranking?

Jeremy Hedges
#31711

[Rich P.]

Re: 67 issues

Jeremy,

Make sure the tiamp box has the ground from the harness and then the ground is jumped to the radiator support. Sorry cant help with the volts at coil my notes are not with me. But I found more problems with TI systems that had to do with bad grounds. Aslo make sure the radiator support is grounded at the horn relay.

Rich

[Michael H.]

Re: 67 issues

Jeremy,

Make sure the tiamp box has the ground from the harness and then the ground is jumped to the radiator support. Sorry cant help with the volts at coil my notes are not with me. But I found more problems with TI systems that had to do with bad grounds. Aslo make sure the radiator support is grounded at the horn relay.

Rich

Here's a simple test procedure. As mentioned in the text, do not crank the engine with the high tension (coil) wire disconnected.

[Jeremy H.]

Re: 67 issues

I have checked all my connections and grounds and now I am getting 6.0v with key on and 6.5v when cranking. Still no spark.
What should I get at the coil?

Jeremy Hedges

[Alan D.]

Re: 67 issues

Check out the info at Tispecialty.com Has articles on what the voltage SB, ect.

[Dick W.]

Re: 67 issues

Here's a simple test procedure. As mentioned in the text, do not crank the engine with the high tension (coil) wire disconnected.

Michael, I have found out that giving those instructions usually gets an Oh S*** out of the party on the other end of the phone.

[Michael H.]

Re: 67 issues

Michael, I have found out that giving those instructions usually gets an Oh S*** out of the party on the other end of the phone.

Ya mean it's kinda like "closing the barn door after the horse got out"?

[Dick W.]

Re: 67 issues

Yup, over the years I have repaired probably 10 amps from the Saturday afternoon mechanic got thru testing the system. Until TI Specialities came on the scene there was no one person that you could take an amp to get repaired. After you once learned the basics of the amps, there are not hard to repair.

[Jeremy H.]

Re: 67 issues

After some testing, I thought it was the distributor. Just happened to have another TI distributor here, and now it is running. Hard to believe it was a distributor that was totally rebuild with less than an hour running time. Thanks for everyones help. Sometimes it gets frustrating.

Jeremy Hedges
#31711

[Michael H.]

Re: 67 issues

After some testing, I thought it was the distributor. Just happened to have another TI distributor here, and now it is running. Hard to believe it was a distributor that was totally rebuild with less than an hour running time. Thanks for everyones help. Sometimes it gets frustrating.

Jeremy Hedges
#31711

I'm not surprised. That's another reason why I permanently disconnected/plugged the vacuum advance unit on my 425 HP 66 car when I bought it. Been 25 years and I still have the same distributor/pole piece in it. (3rd amp though but I finally installed a TISpecialty board)
The constant movement of the pole piece from the vacuum advance eventually breaks the strands in the wire, usually right where they enter the housing.

[Dick W.]

Re: 67 issues

Quick and dirty test for TI distributors if you have distributor machine. Hook a voltmeter to the leads, as the rpm's increase, the voltage should increase.

[Michael H.]

Re: 67 issues

Quick and dirty test for TI distributors if you have distributor machine. Hook a voltmeter to the leads, as the rpm's increase, the voltage should increase.

I've never done that. I'll have to try it next time I have access to a distributor machine and a TI distributor. Can't imagine when that will be though.

[Wayne W.]

Re: 67 issues

Yup, over the years I have repaired probably 10 amps from the Saturday afternoon mechanic got thru testing the system. Until TI Specialities came on the scene there was no one person that you could take an amp to get repaired. After you once learned the basics of the amps, there are not hard to repair.

Funny, I used to build about one a week for the local racers in town. I would stress to them, make sure not to charge the battery with the unit hooked up. Invariably someone on the crew would do it anyway and burn the thing up.