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Old 02-09-2012, 09:56 AM   #1
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Starting Mercruiser on the floor

Hi,

I need to start a mercruiser 260, on the floor. it has the thunderbolt ignition and I'm not sure where to wire the live, to the ignition.

Is there an easy answer to this, ie, one live direct to the coil + ?

Thanks

Pete
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Old 02-09-2012, 10:22 AM   #2
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Yeh, 12v+ to the coil, or any purple wire will do the job.
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Old 02-09-2012, 10:23 AM   #3
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Does this sound about right?

1, Battery lead from battery Negative to block.
2, Wire from battery negative to ground wire eyelet on thunderbolt box.
3, Battery lead from battery positive, to starter.
4, Wire from battery positive to coil positive.

5, Wire from battery positive, touched on solenoid positive, to start.
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Old 02-09-2012, 10:24 AM   #4
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Quote:
Originally Posted by Marinautic View Post
Yeh, 12v+ to the coil, or any purple wire will do the job.
Thanks for that, is there no need for the neg, to the thunderbolt then?
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Old 02-09-2012, 10:25 AM   #5
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nope, that's connected to the engine block, that'll get it's power from your battery leads.
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Old 02-09-2012, 10:30 AM   #6
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Quote:
Originally Posted by Marinautic View Post
nope, that's connected to the engine block, that'll get it's power from your battery leads.
That's great, thanks. Just one more question: I am presuming this will also bypass the Interrupter Switch on the gear shift plate. As I took this off for a member on here but he never got back to me, so it's not wired up.
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Old 03-09-2012, 07:38 PM   #7
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I just found this, if it's any good to anyone. Not a great image but it prints ok on A4. I've got the larger (black box) thunderbolt but I'll see if the wiring is the same.
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Old 03-09-2012, 11:52 PM   #8
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Worth remembering that thunderbolt iv is really only 1 step removed from old fashioned points ignition - in terms of the wiring etc.
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Old 04-09-2012, 01:05 PM   #9
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Cruising area: The Med

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All worked ok, as below. Engine sold.

1, Battery lead from battery Negative to block.
2, Battery lead from battery positive, to starter.
3, Wire from battery positive to coil positive.

4, Wire from battery positive, touched on solenoid positive, to start.
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