Davedstone
Member
At long last Gene is running and very smooth, but concerned as the new ignition coil is running so hot that you can't touch it. The initial problem was the cable which runs from the tachometer to the + side of the ignition coil was essentially passing heavy current. To cut a long story very short, the culprit was the starting solenoid which was grounding. The cable which burnt was replaced which has taken a long time (unwrapping loom) as the dash had to be removed and cable replaced which runs through the bullhead to the ignition coil.
I also had issues with intermittent tachometer, ammeter and oil pressure gauge which was resolved after removing the gauges and cleaning the contact lands on the back of the gauges to the printed circuit board.
In trying to diagnose the original problem I ordered a new ignition coil which I fitted which brings me to the current problem.
The car runs without any misfiring and at the correct temperature, but very concerned about high temperature of the ignition coil. I also checked the alternator which is also new which runs very hot. The battery is charging which I have checked with my DVM and can see the charging on the ammeter.
As I mentioned, I changed the starter solenoid which has a cold start terminal which carries a cable to the (thicker gauge) + side of the ignition coil. This is used when cranking the engine, thus ensuring 12 vdc is present for easier cold start (cold winter mornings) and when the engine is running, the 12 vdc is then fed via the tachometer.
I decided to pull both cables (white with yellow tracer) off the + side of the ignition coil and check (ignition off) both and the lighter gauge cable which comes from the tachometer has no voltage which is correct as this will only be present when the engine is running. The other cable which comes from the cold start terminal reads 1.29 vdc which is strange as it should (correct me if I am wrong) read zero and this voltage will only be present when the starter motor is being engaged as the solenoid is thrown linking the permanent 12 vdc supply to the cold start terminal when the coil pulls the solenoid to make contact. Now I have replaced the starter solenoid with a brand new one.
Questions: Why is my ignition coil (new) getting too hot to touch. Also my alternator is running very hot (can't hold your hand against it) yet it's charging which is also being shown by the ammeter as charging.
Can anyone help me with this. Never checked the ignition coil before for temperature but Imagine it's not right as running this hot would bring about a breakdown on the coil. The can't be a problem with the alternator as it's charging.
The car is fitted with a lumenition mk12 which was already on the car (no doubt fitted back late 70's) when I purchased this.
Thanking anyone in advance for any help or advice.
https://photos.app.goo.gl/D14juiMv7XGWEBSq6 Showing gauges working.
https://photos.app.goo.gl/nqfQB7EqSX4sCF4s7
I also had issues with intermittent tachometer, ammeter and oil pressure gauge which was resolved after removing the gauges and cleaning the contact lands on the back of the gauges to the printed circuit board.
In trying to diagnose the original problem I ordered a new ignition coil which I fitted which brings me to the current problem.
The car runs without any misfiring and at the correct temperature, but very concerned about high temperature of the ignition coil. I also checked the alternator which is also new which runs very hot. The battery is charging which I have checked with my DVM and can see the charging on the ammeter.
As I mentioned, I changed the starter solenoid which has a cold start terminal which carries a cable to the (thicker gauge) + side of the ignition coil. This is used when cranking the engine, thus ensuring 12 vdc is present for easier cold start (cold winter mornings) and when the engine is running, the 12 vdc is then fed via the tachometer.
I decided to pull both cables (white with yellow tracer) off the + side of the ignition coil and check (ignition off) both and the lighter gauge cable which comes from the tachometer has no voltage which is correct as this will only be present when the engine is running. The other cable which comes from the cold start terminal reads 1.29 vdc which is strange as it should (correct me if I am wrong) read zero and this voltage will only be present when the starter motor is being engaged as the solenoid is thrown linking the permanent 12 vdc supply to the cold start terminal when the coil pulls the solenoid to make contact. Now I have replaced the starter solenoid with a brand new one.
Questions: Why is my ignition coil (new) getting too hot to touch. Also my alternator is running very hot (can't hold your hand against it) yet it's charging which is also being shown by the ammeter as charging.
Can anyone help me with this. Never checked the ignition coil before for temperature but Imagine it's not right as running this hot would bring about a breakdown on the coil. The can't be a problem with the alternator as it's charging.
The car is fitted with a lumenition mk12 which was already on the car (no doubt fitted back late 70's) when I purchased this.
Thanking anyone in advance for any help or advice.
https://photos.app.goo.gl/D14juiMv7XGWEBSq6 Showing gauges working.
https://photos.app.goo.gl/nqfQB7EqSX4sCF4s7