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I’m looking for clarification on the TI system for my 1968 L89 BB.
It was missing when I bought this car and I’m looking for clarification on whether there was 2 different amplifiers used.
I don’t have the part numbers in front of me currently, but the 2 different amps are the one with the plug on the amp and the other with the plug on the end of a pigtail coming out of the amp.
NCRS Judging guide says that ALL of 68’s had the plug on the amp with no pig tail.
Searching this forum, folks are saying that early 68’s have the plug amp and after Jan 68 they had a pigtail.
Lectric Limited says there is 2 styles.
My car is an April 25 1968 build.
Hoping someone with a later build 68 can chime in.
Thanks
I have been trying, without too much success, to make some diagrams of the various versions of the TI systems used from 64 thru 71. The info on what is what is very confusing and different documentations differ with each other. Of course, the designation Early and Late add to the confusion as no one seems to know what Early or Late refer to with serial numbers.
What I have been able to come up with is that there are only two different Amplifiers.
1115005 is the unit with the plug directly on the case. 64 thru Early 68.
1115343 is the later unit with the plug on a short cable. Late 68 thru 71.
For 68 Early it should use Amp 1115005 and Harness 6295077. Plug directly into the Amp. Harness is 107 inches.
For 68 Late it should use Amp 1115343 and Harness 6295260. Plug into the cable extension. Harness 106 inches.
For 1969 and later the Harness is 6297596. This Harness is the same as the 6295260 but is a little shorter at 101 inches.
From 64 thru 71 they actually had six different Harnesses. I don't know why it took GM so long to figure out how to wire the TI correctly.
The Coil for a SB should be 1115272 and for a BB it should be 1115263. Don't know why a different number as the coils seem to be interchangeable. Maybe because one was built in Tonawanda and the other in Flint?
I have been trying, without too much success, to make some diagrams of the various versions of the TI systems used from 64 thru 71. The info on what is what is very confusing and different documentations differ with each other. Of course, the designation Early and Late add to the confusion as no one seems to know what Early or Late refer to with serial numbers.
What I have been able to come up with is that there are only two different Amplifiers. 1115005 is the unit with the plug directly on the case. 64 thru Early 68. 1115343 is the later unit with the plug on a short cable. Late 68 thru 71.
For 68 Early it should use Amp 1115005 and Harness 6295077. Plug directly into the Amp. Harness is 107 inches.
For 68 Late it should use Amp 1115343 and Harness 6295260. Plug into the cable extension. Harness 106 inches.
For 1969 and later the Harness is 6297596. This Harness is the same as the 6295260 but is a little shorter at 101 inches.
From 64 thru 71 they actually had six different Harnesses. I don't know why it took GM so long to figure out how to wire the TI correctly.
The Coil for a SB should be 1115272 and for a BB it should be 1115263. Don't know why a different number as the coils seem to be interchangeable. Maybe because one was built in Tonawanda and the other in Flint?
Good stuff Robert!
Thanks for posting this.
Where did you get the info regarding the early and late 68 TI amp?
The NCRS Judging Guide is the only source I can find that says 68 only had one style of amp, the 111505 plug in the amp style.
All other sources agree with you and say early and late style amps for 68.
Thank you!
Getting correct info on any TI stuff seems to be very difficult. I have gone to a number of sites to try and put together a knowledge of all this stuff. The problem is that much of the information contradicts itself. There is a guy Dave Fiedler who has a website "ispecialty.com" and he does a lot of rebuilding of distributors and is considered an expert on TI. I looked at his site to try and get as much info as I could, but even there I found things that I didn't think were completely correct. I sent him an email with two questions that I thought he could answer without looking up anything but never received a response. I have heard that he is different and his work is on the expensive side.
Years ago, when I first got my 69 I was looking at the harness and saw 5 wires going in and 4 coming out and they were different colors. I opened the harness and drew what I found and then drew my complete TI system and then rewrapped the harness. I have been trying to draw several different diagrams of the differences from 64 to 71, but no one can agree on what is completely correct on them. Basically, I have given up trying to make a document that I would put on the Forum.
Getting correct info on any TI stuff seems to be very difficult. I have gone to a number of sites to try and put together a knowledge of all this stuff. The problem is that much of the information contradicts itself. There is a guy Dave Fiedler who has a website "ispecialty.com" and he does a lot of rebuilding of distributors and is considered an expert on TI. I looked at his site to try and get as much info as I could, but even there I found things that I didn't think were completely correct. I sent him an email with two questions that I thought he could answer without looking up anything but never received a response. I have heard that he is different and his work is on the expensive side.
Years ago, when I first got my 69 I was looking at the harness and saw 5 wires going in and 4 coming out and they were different colors. I opened the harness and drew what I found and then drew my complete TI system and then rewrapped the harness. I have been trying to draw several different diagrams of the differences from 64 to 71, but no one can agree on what is completely correct on them. Basically, I have given up trying to make a document that I would put on the Forum.
Don't think he will answer your email, read this TI Specialties
I have a 1968 Corvette and I also have the entire K66 system for the Corvette.
Dave Fiedler is the one who replaced my amplifier board and rebuilt my distributor. He is an expert in his field and very knowledgeable. Many people have had great experiences with him, like myself. Dave is someone who has been burned by people asking questions and that time doesn't pay the mortgage.
If you need the very best tech support for the K66 system then Dave Fiedler is the one person who comes to mind. Treat him respectfully and he will do the same.
There are several Corvette support people who are a bit cantankerous if you get on their nerve.
Thank you.
I've worked with Dave F. before. He's done 2 TI systems for me. does great work but expensive. I'm ok with that because he really is the expert.
My question is can anyone confirm that there was a change during the production year with the TI amps?
Robert has come the closest to listing part numbers, amp numbers etc.
Zip's lists an early and late 68 wiring harness for the TI
Lectric Limited lists 2 different harnesses.
The NCRS Tech Forum where I posted the question has lots of views but no replies yet.
In 1968 there were two (2) wiring harnesses used because of a change in amplifiers in January of 1968. Early-1968 harnesses (GM number 6295077) had a total length of 107-inches and the connector for early-style amplifier (GM number 1115005). Late-1968 harnesses (GM number 6295260) were changed to a total length of 106-inches and had provisions for connecting the later amplifier (GM number 1115343). Also in late-1968 harnesses, and all subsequent harnesses, the ignition power feed came directly from the back of the ignition switch through the use of a special two-wire extension.
Mel! I completely missed that!
Thank you!
In my mind it’s settled. I’ll be using the pigtailed style amp.
NCRS judging guide needs to be changed.
I feel like 68’s are the red headed step child of corvettes ha ha
Much appreciated gents.
1968 Transistorized Ignition amplifier question
