68 tripower ignition question
Melting Slicks
Joined: Dec 2014
Posts: 2,785
Likes: 2,325
From: Central UT
Paul,
The engine bay wiring schematic that is in the video shows the amplifier harness ( black wire) being grounded to the radiator support. I have not checked that harness ground on my car to see if that is the problem but probably is the culprit. I simply ran a separate ground wire back to the alternator ground and everything is running fine so far. Maybe my original harness ground to the radiator support has corrosion n is not supplying sufficient connection.
I installed the TI system on my car back in 74-75 using all factory parts. Purchased an extra amplifier, coil , n distributor at the same time so I do have GM spares of the critical parts. The TI harness in the car has not been replaced since it was installed new back in the day.
I did purchase n install the green K& B board in my amplifier. Didn’t do anything special with the screws that secure the board into the amp housing though. Hope that does not become a problem as the amp is not the easiest component to get to on the car.
The original system has been very reliable for 45+ years so I hope it continues to be a non issue in the car.
appreciate all ur help with the additional information.
Bob
The engine bay wiring schematic that is in the video shows the amplifier harness ( black wire) being grounded to the radiator support. I have not checked that harness ground on my car to see if that is the problem but probably is the culprit. I simply ran a separate ground wire back to the alternator ground and everything is running fine so far. Maybe my original harness ground to the radiator support has corrosion n is not supplying sufficient connection.
I installed the TI system on my car back in 74-75 using all factory parts. Purchased an extra amplifier, coil , n distributor at the same time so I do have GM spares of the critical parts. The TI harness in the car has not been replaced since it was installed new back in the day.
I did purchase n install the green K& B board in my amplifier. Didn’t do anything special with the screws that secure the board into the amp housing though. Hope that does not become a problem as the amp is not the easiest component to get to on the car.
The original system has been very reliable for 45+ years so I hope it continues to be a non issue in the car.
appreciate all ur help with the additional information.
Bob
I'm glad your system has been and is still working well. You were smart to purchase extra items at the same time! If you ever decide to sell the coil please let me know. If you have access to a lift the amp box is much easier to get to. Always happy to help - that's the great thing about this forum as there are lots of experienced owners willing to lend a hand. Have a great day/weekend, Paul
Safety Car
Joined: Nov 2007
Posts: 4,498
Likes: 810
From: East Central Florida
Rich,
Is there a specific ground in the TI harness for the amp and where is it located? The internal board has a black, gray and pink wires from the harness. Is one of these wires ( black) also a case ground?
Am asking as I recently had a failure to start after the car (70 BB coupe with all factory parts) sat for 30 min after a drive. Once I got the car towed home, took my spare GM amp , plugged it in n then the engine fired right up. I had a jumper to ground the case to the frame. Noticed that when I removed the ground jumper the engine quit.
I purchased the green K&B updated board and installed it in the amp housing. Added a case ground to the amp engine fires up n runs fine.
The amp as u know, is mounted to the front side of the left front fender on fiberglass. So there is no case ground thru the fender. Am wondering why the amp ran flawlessly for 45 yrs with no external case ground n now needs one? If there is a ground in the TI harness, that may have failed in some way. If so, where do I look?
Thoughts?
Bob
Is there a specific ground in the TI harness for the amp and where is it located? The internal board has a black, gray and pink wires from the harness. Is one of these wires ( black) also a case ground?
Am asking as I recently had a failure to start after the car (70 BB coupe with all factory parts) sat for 30 min after a drive. Once I got the car towed home, took my spare GM amp , plugged it in n then the engine fired right up. I had a jumper to ground the case to the frame. Noticed that when I removed the ground jumper the engine quit.
I purchased the green K&B updated board and installed it in the amp housing. Added a case ground to the amp engine fires up n runs fine.
The amp as u know, is mounted to the front side of the left front fender on fiberglass. So there is no case ground thru the fender. Am wondering why the amp ran flawlessly for 45 yrs with no external case ground n now needs one? If there is a ground in the TI harness, that may have failed in some way. If so, where do I look?
Thoughts?
Bob
The 3 wires going to the Amp are Power, PU coil in from distributor, and Amp out to Coil+.
I see later you got the K&B board. Just watch that those mount screws stay tight. If you put lockwashers on them you should be okay. If not, you may get some trouble.
Rich
