Halfhitch
Well-Known Member
- Aug 24, 2021
- 837
- Boat Info
- 1988 Laguna 23CC
- Engines
- 1988 Mercury 135 Black Max twins
I have twin 1988 135 Merc 2 strokes on my Laguna 23. Neither engine is charging. The previous owner had the ignition/charging system updated to CDI brand components. Along with it he installed 2 new AGM batteries. I am now trying to sort out the reason for no charging voltage going to the batteries. My first check was to see if the proper parts were installed and it appears that is so. In reading the installation instructions from CDI for the stator and the rectifier, it warns not to use a maintenence free, AGM or Gel Cell battery. This is mentioned in both documents. I highlighted the notation in the documents attached.
I know some of the older electronics could be damaged by removing a battery cable while the engine is running. To that thought, I found the previous owner had installed a new Blue Seas battery switch but he put in a switch that has a #1 and a #2 but no "Both". If the switch is moved between 1 and 2 while the engines are running there is a time there when neither is connected. No doubt this has been done while the engines were running. No way to know. Why this switch was chosen, I have not a clue. I will be installing a Blue Seas e series Dual Circuit switch with a SI series ACR.
My first question in sorting this out is, could the fact that the batteries are AGM could that be the reason for "no charging"? Could the AGM not excited the rectifier for some reason? Could the fact that I have run it with AGM batteries be reason enough to have "smoked" the rectifiers?
Thanks for any insight on this. I'm just trying to get things understood before I start just throwing parts at it.
https://www.cdielectronics.com/wp-admin/admin-ajax.php?action=cdi_spget&spurl=https://sharepoint.cdielectronics.com/Controlled Documents/Installation Sheets/IS-274-5456-S15.pdf
https://www.cdielectronics.com/wp-admin/admin-ajax.php?action=cdi_spget&spurl=https://sharepoint.cdielectronics.com/Controlled Documents/Installation Sheets/IS-154-6770.pdf
I know some of the older electronics could be damaged by removing a battery cable while the engine is running. To that thought, I found the previous owner had installed a new Blue Seas battery switch but he put in a switch that has a #1 and a #2 but no "Both". If the switch is moved between 1 and 2 while the engines are running there is a time there when neither is connected. No doubt this has been done while the engines were running. No way to know. Why this switch was chosen, I have not a clue. I will be installing a Blue Seas e series Dual Circuit switch with a SI series ACR.
My first question in sorting this out is, could the fact that the batteries are AGM could that be the reason for "no charging"? Could the AGM not excited the rectifier for some reason? Could the fact that I have run it with AGM batteries be reason enough to have "smoked" the rectifiers?
Thanks for any insight on this. I'm just trying to get things understood before I start just throwing parts at it.
https://www.cdielectronics.com/wp-admin/admin-ajax.php?action=cdi_spget&spurl=https://sharepoint.cdielectronics.com/Controlled Documents/Installation Sheets/IS-274-5456-S15.pdf
https://www.cdielectronics.com/wp-admin/admin-ajax.php?action=cdi_spget&spurl=https://sharepoint.cdielectronics.com/Controlled Documents/Installation Sheets/IS-154-6770.pdf
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