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Originally Posted by ezstriper
(Post 4211439)
used several of the large cap HEI's I always buy the correct connectors from summit splice them to the power and tach and roll on...
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Originally Posted by shunter2005
(Post 4210108)
Sorry, it's not that I didn't trust you, I just didn't understand your explanation of where you got the power. I took it that you somehow plugged into a flat plug in the EFI harness and that threw me, since mine is carbed. You threw me another little curve with the additional wire for the oil pressure alarm out of the harness. As I said, I am electricity challenged and I just couldn't grasp it. I kept thinking about the ignition module and the knock sensor harness plugs in my boat and didn't know if I could use the purple wires there. I finally realized that all the purple wires were the same size (DUH!!), so I opted for the existing purple (+) coil wire that wasn't being used. All that worry for basically nothing. I kept reading everywhere that the DUI had to have a 12 ga. wire for power.
Oh, and you were certainly correct. If you over think it, it does become more complicated than it has to be and will drive you crazy. I have spent hours searching for info about this. Next time (if there is one), I will ask more pointed questions and try to get it straight in my thick old head. Thanks |
Originally Posted by shunter2005
(Post 4210108)
If you over think it, it does become more complicated than it has to be and will drive you crazy. I have spent hours searching for info about this.
Thanks Overthinking can make things mind boggling with no way out. LOL. |
Originally Posted by SB
(Post 4211653)
And that's what happens with some people on the subject of oil on every motorsport / hobby forum on the internet.
Overthinking can make things mind boggling with no way out. LOL. |
I realize this is an old thread but this is where the search function lead me. I'm hoping some of you are still active. I've gathered that its ok to just wire the DUI unit into the factory ignition wire. My question is in regards to the factory Mercruiser ignition control and knock modules. Can I leave them plugged in and expect them to function as advertised?
Thanks in advance and again my apologies for resurrecting a dinosaur. |
No, you need to get them out of the system. The DUI is self contained. What happened to your TB V? They don't fail often.
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Originally Posted by NHGuy
(Post 4628822)
No, you need to get them out of the system. The DUI is self contained. What happened to your TB V? They don't fail often.
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I was running a DUI ignition off of the purple wire, and then wired in a relay and 12g wire and it completely transformed the performance of the boat. Stronger midrange and top end gained a couple hundred rpm. |
Originally Posted by Baja Rooster
(Post 4628843)
I was running a DUI ignition off of the purple wire, and then wired in a relay and 12g wire and it completely transformed the performance of the boat. Stronger midrange and top end gained a couple hundred rpm. Was it like this? 85 - PURPLE 86 - GND 87 - TO DIST 87a - NOT USED 30 - BATT+ |
This is a handy little relay from Amazon. A better way to go would be to get another Merc trim/starter relay as they have been proven in marine use. Another reason not to run the ignition off of the starter is the tether kill switch won’t kill the ignition. https://cimg6.ibsrv.net/gimg/www.off...f18b7cfa2e.gif ONLINE LED STORE 40/30 Amp Waterproof Relay Switch Harness Set - 12V DC 5-Pin SPDT Automotive Relays 12 AWG Hot Wires https://www.amazon.com/dp/B01N66W2XF/ref=cm_sw_r_cp_api_i_RuydBbK7SX3ZA |
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