Rstacy
Seaman Apprentice
- Joined
- Sep 22, 2017
- Messages
- 33
Let me start by saying that CDI is very quick to respond to email questions. I appreciate that.
I have a 1978 Merc 900 that is putting out about 20 volts. I bought a CDI regulator/rectifier to cure this but the motor started surging at WOT with the CDI unit.
I sent CDI a note explaining the problem. This is some of the reply.
> sounds like you may have more
> problems than just a high charging on the rectifier. First you need to look
> at what battery you have in the boat, if it has come from Wal-Mart or any
> other place like Advanced or Interstate, Autozone all of those batteries
> are maintenance free batteries with fill caps on them and they are made for
> cars & Trucks not outboard motors. The battery you need for this motor is a
> Deka part number DP24 and also i don't know what rectifier you got from us
> but i would get one of regulated rectifiers part number 193-5114 you will
> have to put on the bullet connectors to make it fit and only use one bolt
> to hold it on but it will work great.
OK. I may need a different battery. If it is the battery causing the high voltage and replacing the battery with a Deka battery will cure this, then why do I need the CDI unit?
I then asked why the engine was surging at WOT with the CDI unit and this is where he lost me.
> I'm so sorry that i didn't answer that question.
>The reason it wants to act that way is now that it's charging again and
>the battery has a link to the stator it can back
> feed the voltage back to the stator and the stator doen't like voltage coming
>back to it so it will sometimes get a miss at higher rpms cause the stator is
>trying to make a lot of voltage. Hope this helps you!
You lost me. Tell me again why my motor is surging at WOT with the CDI unit and runs fine with the stock unit.
BTW, the current battery is an Interstate deep cycle marine battery.
I have a 1978 Merc 900 that is putting out about 20 volts. I bought a CDI regulator/rectifier to cure this but the motor started surging at WOT with the CDI unit.
I sent CDI a note explaining the problem. This is some of the reply.
> sounds like you may have more
> problems than just a high charging on the rectifier. First you need to look
> at what battery you have in the boat, if it has come from Wal-Mart or any
> other place like Advanced or Interstate, Autozone all of those batteries
> are maintenance free batteries with fill caps on them and they are made for
> cars & Trucks not outboard motors. The battery you need for this motor is a
> Deka part number DP24 and also i don't know what rectifier you got from us
> but i would get one of regulated rectifiers part number 193-5114 you will
> have to put on the bullet connectors to make it fit and only use one bolt
> to hold it on but it will work great.
OK. I may need a different battery. If it is the battery causing the high voltage and replacing the battery with a Deka battery will cure this, then why do I need the CDI unit?
I then asked why the engine was surging at WOT with the CDI unit and this is where he lost me.
> I'm so sorry that i didn't answer that question.
>The reason it wants to act that way is now that it's charging again and
>the battery has a link to the stator it can back
> feed the voltage back to the stator and the stator doen't like voltage coming
>back to it so it will sometimes get a miss at higher rpms cause the stator is
>trying to make a lot of voltage. Hope this helps you!
You lost me. Tell me again why my motor is surging at WOT with the CDI unit and runs fine with the stock unit.
BTW, the current battery is an Interstate deep cycle marine battery.