Thunderbolt V swap to Tunderbolt IV
#1
Registered
Thread Starter
Thunderbolt V swap to Tunderbolt IV
I am trying too swap out my TB V iginiton modules for TB IV modules. The reason is too get around the Rev limiter at 5300 rpm. Has this been done and can someone tell me how too do it.
Thanks James
Thanks James
#2
Ginger or Mary Ann?
Charter Member
Re: Thunderbolt V swap to Tunderbolt IV
Not familar with the T-bolt V, so not sure if this is of any help
http://www.mercruiserparts.com/Show_...L+AND+IGNITION
Item 7a is what I used to eliminate my rev limiter when running my blower motor.
Item 43 is what was stock, utilizzing the rev control: http://www.mercruiserparts.com/Show_...2%2DF213244%29
http://www.mercruiserparts.com/Show_...L+AND+IGNITION
Item 7a is what I used to eliminate my rev limiter when running my blower motor.
Item 43 is what was stock, utilizzing the rev control: http://www.mercruiserparts.com/Show_...2%2DF213244%29
Last edited by US1 Fountain; 03-21-2005 at 04:47 PM.
#3
Registered
Thread Starter
Re: Thunderbolt V swap to Tunderbolt IV
Here is what I have, Number 15 & 20, one is a Spark module and the other is a Ignition module, which one has the Rev-limiter in it and where do I wire in the TB IV module?
Thanks again for all the help, cant aford MSD yet, trying too get by this year.
James
http://www.mercruiserparts.com/Show_...CAL+COMPONENTS
Thanks again for all the help, cant aford MSD yet, trying too get by this year.
James
http://www.mercruiserparts.com/Show_...CAL+COMPONENTS
#4
VIP Member
VIP Member
Re: Thunderbolt V swap to Tunderbolt IV
The rev limiter is in the ignition module.
Here's how I would do it.
Buy the 7a harness, and the module,
the harness connects up to the coil,
distributor, and module.
Disconnect the existing two wires
from the distributor, tape up, seal,
insulate,....you get the point.
Unplug the TBV module, seal, secure that plug.
( You've now done away with all inputs/outputs
to/from the TBV module)
Unplug the harness forn the knock control
module, secure, seal, etc.
Connect up the purple wire out of harness
7a to + coil.
Connect up the gray wire out of harness 7a
to - coil.
Out of harness 7a, connect up the two wires to
the distributor,( white/red, and white/green)
the distributor should be marked for which wire
goes where ( color)
Harness 7a also has a ground wire, connect to
a good ground.
Mount TBIV module, plug in, you should be in business.
( You now no longer have a rev limiter, or knock
control )
Doing it this way, you don't butcher up the harness,
and you can put it back to original very easily.
Hope this helps.
Here's how I would do it.
Buy the 7a harness, and the module,
the harness connects up to the coil,
distributor, and module.
Disconnect the existing two wires
from the distributor, tape up, seal,
insulate,....you get the point.
Unplug the TBV module, seal, secure that plug.
( You've now done away with all inputs/outputs
to/from the TBV module)
Unplug the harness forn the knock control
module, secure, seal, etc.
Connect up the purple wire out of harness
7a to + coil.
Connect up the gray wire out of harness 7a
to - coil.
Out of harness 7a, connect up the two wires to
the distributor,( white/red, and white/green)
the distributor should be marked for which wire
goes where ( color)
Harness 7a also has a ground wire, connect to
a good ground.
Mount TBIV module, plug in, you should be in business.
( You now no longer have a rev limiter, or knock
control )
Doing it this way, you don't butcher up the harness,
and you can put it back to original very easily.
Hope this helps.
Last edited by jt29olhp500s; 03-21-2005 at 05:46 PM.
#5
Registered
Thread Starter
Re: Thunderbolt V swap to Tunderbolt IV
Thanks, that is great!!
What do I do with the "Spark Module" leave it plugged in or not? That is part # 20 in the pic.
James
What do I do with the "Spark Module" leave it plugged in or not? That is part # 20 in the pic.
James
#6
VIP Member
VIP Member
Re: Thunderbolt V swap to Tunderbolt IV
Originally Posted by excursion
Thanks, that is great!!
What do I do with the "Spark Module" leave it plugged in or not? That is part # 20 in the pic.
James
What do I do with the "Spark Module" leave it plugged in or not? That is part # 20 in the pic.
James
the spark module........unplug it.
#8
Registered
Thread Starter
Re: Thunderbolt V swap to Tunderbolt IV
I am a little confused, what is part #15 then? It has two pin style connectors. In the diagram they are calling that the ignition module. I had one of these go out last year and had no spark to the plugs.
James
James
#9
Registered
Thread Starter
Re: Thunderbolt V swap to Tunderbolt IV
This is what I have in the boat marked A & B, both of them have a purple wire coming out of them, and they OHM out at the Coil positive terminal. The #A module has the grey, negative to coil and white/green and white/red wires that go too the distributor.
There are two pin connections on #A the small connector has only one wire coming out purple.
Still stumped????
There are two pin connections on #A the small connector has only one wire coming out purple.
Still stumped????
Last edited by excursion; 03-21-2005 at 09:35 PM.