OMC 5.0 HO Cobra ignition help, Pentronix, Resister Wire??

[Jaysad]

To All,
I have a 1990 Chris Craft 21' Cuddy, OMC Cobra Ford 5.0 HO, (302 w/2bbl holley). I added the Pentronix Ignition, Pentronix Flame Thrower Ciol, new CDI ESA as and up grade. After installing everything, I reset the timing to 10 deg. BTDC, but it wasn't running very smoothly. So I played with the timing, and got it running better. Took it out, started to open it up, but it was running bad, so I played with the timing again and got it to run better. After 6 or 7 time out running all day sking, tubing, WOT just having great family time. It never realy seemed to run just right Now when I trim it up or down the engine start to cut out
Anybody else having trouble like this?

Thanks,
Jeff

 

[Blk-n-Blu]

Re: OMC 5.0 HO Cobra ignition help, Pentronix, Resister Wire??

Check out this thread, Hope it helps:
http://forums.iboats.com/showthread.php?t=423961

 

[Jaysad]

Re: OMC 5.0 HO Cobra ignition help, Pentronix, Resister Wire??

Thanks for the info. I have read this before.
The trouble I think I'm having is low voltage at the + side of the coil 3.75v with the key on. ? Is one of the factor wire the resister wire, and do I need with the new ignition?

 

[Blk-n-Blu]

Re: OMC 5.0 HO Cobra ignition help, Pentronix, Resister Wire??

Did you scroll down to the Pertronics section and check out the embedded links.

 

[Jaysad]

Re: OMC 5.0 HO Cobra ignition help, Pentronix, Resister Wire??

Yes, I have read all links.

There are 3 wires on the + side of coil.
red one to ignitor
redish pink one to back of alt.
purpleish one going to starter solio.
3 wires on - side of coil.
Gray one going to tach.
Gray one going to the New ESA from CDI (it works preft)
Black one going to ignitor
The voltage is everywhere on the redish, pink one.
With key "on", wires on "+" side removed from the coil, redish one 12v, purpleish one 0v, ignitor 0v, Ok, I reinstall them, I get 3.75v on "+" side of coil.
Egine running 5v.

 

[Jaysad]

Re: OMC 5.0 HO Cobra ignition help, Pentronix, Resister Wire??

Why does the purpleish wire go to the starter solio? What does it do?

 

[Blk-n-Blu]

Re: OMC 5.0 HO Cobra ignition help, Pentronix, Resister Wire??

You may have seen this before. Thanks to Don S:
http://forums.iboats.com/showthread.php?t=167035

 

[Jaysad]

Re: OMC 5.0 HO Cobra ignition help, Pentronix, Resister Wire??

Awsome
Thank you so much!
? How about something like that with the ignition system, (dis., coil, wiring)

 

[a70eliminator]

Re: OMC 5.0 HO Cobra ignition help, Pentronix, Resister Wire??

It's these type of problems that keep me running good ol points on my OMC.
I did however install a pertronix ignitor II on my hotrod and I seem to remember the instructions stressing for a seperate 12v supply directly from the battery.

 

[Jaysad]

Re: OMC 5.0 HO Cobra ignition help, Pentronix, Resister Wire??

It seems like this isn't a very good up grade so far!
I hope someone can help!

 

[carolynrose]

Re: OMC 5.0 HO Cobra ignition help, Pentronix, Resister Wire??

I did the Pertronix upgrade with the resistor fix a while ago and it worked great for a while. Now if the boat cools off while drifting, when I start it up sometimes when going into gear it will stall like the key was shut off. I've read a lot of posts that say the resistor fix doesn't last, and I always thought it was kinda hinky. So now I am replacing the ESA module with the CDI unit. Everyone raves about the CDI unit because it will work with the Pertronix. BUT, I spoke to the troubleshooting guys at CDI and they said the unit will only work correctly with coils that have a primary resistance of 3 - 3.5 Ohms. Most of the Pertronix Flamethrower coils have less than 1 ohm of resistance. They said it is imperative that you check the primary resistance and adjust it with either a ballast resistor or replace with a coil that has 3 -3.5 ohms. When I installed the Pertronix unit I took the resistor wire out of the circuit like they suggested and you should do the same because the resistance changes with age and temperature. It still seems like the CDI unit is a better direct bolt on. Good Luck

 

[bruceb58]

Re: OMC 5.0 HO Cobra ignition help, Pentronix, Resister Wire??

Put your points back in and your problem is solved!

I hate to say it but these Pertronix modules are just not that reliable. Before I put a Pertronix in , I would just go and bite the bullet and put in a Delco EST distributor.

 

[Jaysad]

Re: OMC 5.0 HO Cobra ignition help, Pentronix, Resister Wire??

Yes, I could do that, but I have already bought this thing. Surly somebodyhas installed this kit (up grade) on their boat and can make it work.
The wiring seems so simple.
Do you think I'm going to have trouble with it after I get this installed, and working wrightway?

 

[bruceb58]

Re: OMC 5.0 HO Cobra ignition help, Pentronix, Resister Wire??

Sounds like you have a major voltage drop somewhere. Attach the negative lead of your meter to the negative terminal of your battery and start measuring voltages. Start at your ignition switch...then go past your safety lanyard. Once you find your voltage drop, you may possibly have found your problem.

What is your battery voltage at while the engine is on?

Also, why do you have a wire that goes from your positive side of the coil to you alternator? That does not sound right.

 

[haulnazz15]

Re: OMC 5.0 HO Cobra ignition help, Pentronix, Resister Wire??

Put your points back in and your problem is solved!

I hate to say it but these Pertronix modules are just not that reliable. Before I put a Pertronix in , I would just go and bite the bullet and put in a Delco EST distributor.

I haven't seen much evidence of Pertronix units being any less reliable than any other electronic dizzy when installed correctly.

 

[bruceb58]

Re: OMC 5.0 HO Cobra ignition help, Pentronix, Resister Wire??

I haven't seen much evidence of Pertronix units being any less reliable than any other electronic dizzy when installed correctly.

Do a google search...you will find many.

 

[Jaysad]

Re: OMC 5.0 HO Cobra ignition help, Pentronix, Resister Wire??

The volyage @ battery is 12.5v
Solin. 12.5v
Key switch "on", "Start" 12.5v
Redish wire & Purpleish wire was made up together @ + side of factor coil.
Redish wire loops back and forth and is spliced into a wire that going to the back of the Alt. to what looks like a box made in the alt. Another wire from that box is going to the ESA.
The purpleish wire is going to the solin.
These wires, not conected to the coil are 12.5v with key on.
I install them to the + side of coil, key on, Red lead on meter to these wire, Black lead to engine ground 6v.

 

[Blk-n-Blu]

Re: OMC 5.0 HO Cobra ignition help, Pentronix, Resister Wire??

Here is a troubleshooting guide from the Hastings link in my prior post.
http://www.pertronix.com/support/tips/default.aspx

 

[bruceb58]

Re: OMC 5.0 HO Cobra ignition help, Pentronix, Resister Wire??

You need to make all your measurements with the leads already attached to your coil. Did you do that?

Where is the Pertronix unit getting its voltage from?

 

[Jaysad]

Re: OMC 5.0 HO Cobra ignition help, Pentronix, Resister Wire??

Thanks to all !!!!
I ran a wire from the igntion "I" key switch to the + side of the coil, put the red ignitor wire on there to, now I have 12.5v on the + side of coil. That baby fired right up. So, I'm going to tape up the 2 old wires, keep my old points in the tools box (for backup). I'm on my way to the lake and try it out!
I let ya know what happens!
Man I love this place!