70Hp Force (Made by Mercury) Will Not Start!

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laxxrick

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Apr 22, 2010
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I've checked the Engine FAQ and this is what I've done so far:

1.) I'm using a heavy duty battery starter unit instead of a battery. I want to make sure the engine will turn over before I invest in a deep cycle marine battery.

2.) I turned the key and I do hear the solenoid click, but the starter doesn't even attempt to spin.

3.) I measured the voltage coming in to the solenoid @ 14V.

4.) I jumped the solenoid with a screwdriver: still just a click, no starter spinning.

5.) With the solenoid jumped, I measure the voltage on the solenoid post that provides power to the starter @ 10.5V.

6.) With the solenoid jumped, I measure the voltage on the post on the starter where the power goes @ 10.5V.

Now my question is this: is the 10.9V too low a voltage to actually spin the starter? I think that's normal, but I'm as novice as novice can be when it comes to this.

What do you guys think? Does that sound more like a solenoid or the starter itself?

It seems to indicate starter, but I find it hard to believe it just won't spin at all.
 

JB

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Mar 25, 2001
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45,907
Re: 70Hp Force (Made by Mercury) Will Not Start!

Sounds to me like a bad ground where the battery ground cable bolts to the engine, Rick. The problem may not be too little voltage, but too little current.

At stall speed (not turning) the voltage should drop to near zero. If it does not there is resistance where it should not be. Maybe in the starter or maybe in the external wiring. The wiring is quick and free to check out.

Take all of those connections with the big cables off, clean them shiny and reconnect (include battery terminals).

Good luck. Let us know how you make out. :)
 

JB

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Mar 25, 2001
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Re: 70Hp Force (Made by Mercury) Will Not Start!

This is a double post and an example of why double posts are not welcome here.

It is very annoying to answer a question in one forum and then run onto the same #$%^&* question in another forum.
 
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