mainexile
Petty Officer 1st Class
- Joined
- Aug 14, 2007
- Messages
- 223
Help guys, please!
Earlier in the week I posted about how activating the trim circuit on my 1978mercruiser 470 kills the engine. Previous owner made some major re-wiring changes including removal (without replacement) of the trim sending and trim limit switches. He also installed a switch on the dash that breaks the ground circuit to the trim pump motor. Closing that switch kills the engine. I have tried to trace out all the engine and trim circuit wires using the wiring diagrams in the Selco on-line manuals, which are not the best I've ever seen. In fact, I can't find a single wiring diagram that accuratgely reflects the configuration of my engine/trim units. Selco apparently doesn't believe in publishing a comprehensive, all-inclusive wiring diagram. That being said, does anyone have diagrams that show all of the points common to engine and trim electrical? The trim is a single soleniod and the ignition starter solenoid is the Ford-type mounted on the block (as opposed to the GM-type that sits on top of the starter). The only apparent, unorthodox wiring change (other than the removal of the trim switches) is in the harness coming from the three-botton trim control panel. The blue wire (up) has been cut and a spade plug used to re-splice it. There is a jumper from the spade plug to the purple (trailer) wire. Pushing the "up" button has no effect on the stern tilt. Pushing the "up trailer" (middle) button raises the stern drive. The diagram for a three-button, single-solenoid tilt/trim refers to a "normally closed reverse interlock switch, but I cannot locate this switch. And I cannot determine what actually happens when I close the dash switch that kills the engine and energizes the tilt/trim motor circuit. I realize that this is somewhat convoluted, but I'll be happy to try to explain further if you need more information - just ask me whatever you need to diagnose this.
Thanks in advance.
Steve
B/T/W- I have now pulled out what little remaining hair I had.
Earlier in the week I posted about how activating the trim circuit on my 1978mercruiser 470 kills the engine. Previous owner made some major re-wiring changes including removal (without replacement) of the trim sending and trim limit switches. He also installed a switch on the dash that breaks the ground circuit to the trim pump motor. Closing that switch kills the engine. I have tried to trace out all the engine and trim circuit wires using the wiring diagrams in the Selco on-line manuals, which are not the best I've ever seen. In fact, I can't find a single wiring diagram that accuratgely reflects the configuration of my engine/trim units. Selco apparently doesn't believe in publishing a comprehensive, all-inclusive wiring diagram. That being said, does anyone have diagrams that show all of the points common to engine and trim electrical? The trim is a single soleniod and the ignition starter solenoid is the Ford-type mounted on the block (as opposed to the GM-type that sits on top of the starter). The only apparent, unorthodox wiring change (other than the removal of the trim switches) is in the harness coming from the three-botton trim control panel. The blue wire (up) has been cut and a spade plug used to re-splice it. There is a jumper from the spade plug to the purple (trailer) wire. Pushing the "up" button has no effect on the stern tilt. Pushing the "up trailer" (middle) button raises the stern drive. The diagram for a three-button, single-solenoid tilt/trim refers to a "normally closed reverse interlock switch, but I cannot locate this switch. And I cannot determine what actually happens when I close the dash switch that kills the engine and energizes the tilt/trim motor circuit. I realize that this is somewhat convoluted, but I'll be happy to try to explain further if you need more information - just ask me whatever you need to diagnose this.
Thanks in advance.
Steve
B/T/W- I have now pulled out what little remaining hair I had.
