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I am not getting any power to the coil. I have checked and traced wires as best as I can to determine where it could be loosing power but have had no luck. Checked selenoid and I believe its ok? My next step is to remove distributer and make sure it has a good ground. Anybody have any ideas? It would be greatly appreciated. Thanks.
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When you say, no power to the coil, and then you say you want to remove the distributor, I am confused. The distributor is on the ground side of the coil. If you are not getting power to the coil, anything you do with the distributor will not change the no power to the coil situation.
Power is supplied to the positive side of the coil by the ECC relay. It is one of the "Bosch" cube type relays on the plate on the back of the engine.
Here is a little more info about the relays.
http://www.planetnautique.com/vb3/sh...ghlight=relays -
Daniel,
thank you for the info and link. Only reason I was going to take out distrubuter is to make sure it didnt have any build u or corrosion on it to make sure it had a good ground. One thing i did do since you say both relays are the same is unplugged one and put it on the other and still was not getting any power to coil. your thoughts?Comment
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Confirm there is power to pin 30 on both relay sockets. This pin on the on the sockets should be hot any time the battery is connected.
You can download the GT-40 service manual from the downloads section of this site. It has some good diagrams of the electrical systems near the back of the manual.Comment
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checked both relays on the 30 pin and both have power???Comment
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Have you downloaded the GT-40 service manual yet?
Like I said, the ECC relay supplies power to the ignition coil, and a bunch of other stuff. The engine will crank without either relay working, or even plugged in.
The Gray and Blue wire on the ignition coil is positive. This wire should have 12 volts on it any time the key is on.Comment
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Do you still have the large fuse in the battery box??
This is the power source for the EEC relay. It was a known problem and PCM did a modification to remove it. Pull fuse and check and clean, it maybe the cause of your problem.
http://www.correctcraftfan.com/forum...computer-powerComment
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Ok. So after many hours of tracing wires and reading the manual. I found the problem. Relays were not getting any power because the 15 and 12.5 breakers were not getting any power. The power wire for those two was traced and it was found that the wire was cut at the end and was not connected to battery. So I ran the cable to battery and presto! I have power to the breakers,relay and the motor is now running! Thanks for replying to my post and for all the helpful suggestions!Comment
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If the wire was cut how did it ever run?
Did you look at the above post on EEC power. It shows how do remove that troublesome separate EEC power circuit.Comment
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I purchased the boat with the motor not running. Also, the red wire that leads from the battery box like the pictures to the link above did not lead to a waterproof connector with red on one side and purple on the other. I had no power at the 15 or 12 1/2 breakers. I found a solid purple wire with the round terminal but it was connected to the selonoid but it was not at the terminal where the main wire is connected to. I did try and remove the purple cable and connected it to the main power terminal at the selonoid and still had no power. That is when I decided in desperation to connect the cut end of the red wire to the battery to see what would happen and thats when I had power, spark and motor ran.Comment
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The post on the power assist solenoid that you connect the purple wire to is the main positive battery cable from the battery. Gives you the same result as the extra wire at battery terminal that you are using but has no joins in it plus is a much larger gauge. If you re connected the wire at battery box and the engine fired then the other end where it goes to the 12.5 amp breaker must have still been connected. Take some pictures of the battery box end and the wiring into 12.5 amp breaker. There is already a purple wire on power assist relay plus the one you add after doing the modification. The purple wire you cut and add a ring terminal to is at waterproof connector. There is red on one side from battery box and purple on the other side of this connector that goes into the shielded loom up to the 12.5 amp EEC power breaker.
The 15 amp breaker (early GT40's had a 20 amp) is for the fuel pumps it gets its power from the 60 amp breaker which in turn gets its voltage from the battery post on power assist solenoid. Have attached wiring diagram from GT40 manual.
Sounds like the waterproof fuse holder was removed but they left the wiring in place. Somebody has obviously been there before you which is confusing the matter.
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