The Triumph Dolomite Club - Discussion Forum

The Number One Club for owners of Triumph's range of small saloons from the 1960s and 1970s.
It is currently Thu Apr 18, 2024 3:30 pm

All times are UTC+01:00




Post new topic  Reply to topic  [ 36 posts ]  Go to page Previous 1 2 3
Author Message
 Post subject: Re: Misfire Again
PostPosted: Mon Aug 14, 2017 4:01 pm 
Quote:
3. the red lead from the magnetronic went to the ign switched + in the fuse box,
4. the black lead from the magnetronic to the VE- on the coil.
5. no changes were made when the coil was changed.
Exactly, when I said take off the ballast resistor I meant from the MS3 , later cars have a ballast wire so then it's a straight swap.


Top
   
 Post subject: Re: Misfire Again
PostPosted: Mon Aug 14, 2017 4:31 pm 
Offline
Future Club member hopefully!
Future Club member hopefully!
User avatar

Joined: Wed Jul 22, 2015 12:58 pm
Posts: 1293
Location: London
Quote:
Quote:
3. the red lead from the magnetronic went to the ign switched + in the fuse box,
4. the black lead from the magnetronic to the VE- on the coil.
5. no changes were made when the coil was changed.
Exactly, when I said take off the ballast resistor I meant from the MS3 , later cars have a ballast wire so then it's a straight swap.

:thumbsup: I was getting worried when you said

"the MS3 does come with the ballast resistor but the concensus seems to be to ditch it and bypass the car's ballast wire"

_________________
NRW 581W Sprint


On the motorway no one can hear me sing!
Construed as a public service, self preservation in reality.


Top
   
 Post subject: Re: Misfire Again
PostPosted: Tue Aug 15, 2017 11:56 am 
Offline
Future Club member hopefully!
Future Club member hopefully!

Joined: Tue Oct 03, 2006 9:45 pm
Posts: 11179
Location: Middlesex
Only replace the bypass feed to the coil if you have a different full voltage coil like a bosch blue or DLB105.

If you run a ballasted coil at full volts it will eventually fail and possibly take the lumenition with it.

Ok Ive now read back through the various posts and can see we have mostly correct information but its open to being interpreted incorrectly.
Its good you have a smoother running car, but I'm concerned you may now have a ballasted coil running at full volts. You do NOT want this. It WILL fail as Jeroen, myself and others have said. I'm now also a little uncertain as to how your car is wired up right now.

The safest thing is to re-instate all the original connections as they were when the car was made. So you want all the white and pink wires and white and other tracers (I think the grey one is for the rev counter and may be on the coil minus) on the coil plus, and the lead to the points from coil minus going to the distributor. I suspect this original lead is now replaced with the black lead to your lumenition. Leave that...its fine, leave that in place.

What happens is when you start the car your white pink wire supplies the higher voltage from the starter to the coil plus but ONLY when you have the key in the start position and the starter is turning. If you have an extra supply from the fuse box to the same coil plus connector you will have full battery volts when the ignition is on and this will damage/burn out your coil.

Now just take your lumenition red lead and join it to the fuse box white wire side as before. It MUST NOT go to any coil connection, only direct to the lumenition module.

Do all this and it should work fine.

Jonners

_________________
Note from Admin: sadly Jon passed away in February 2018 but his humour and wealth of knowledge will be fondly remembered by all. RIP Jonners.


Top
   
 Post subject: Re: Misfire Again
PostPosted: Wed Aug 16, 2017 11:26 am 
Offline
Future Club member hopefully!
Future Club member hopefully!
User avatar

Joined: Fri Jan 06, 2017 11:14 pm
Posts: 246
Many thanks to all who contributed in one way or another to my post.

When I bought the coil (MS3) it came with a ballast which I had removed since the Sprint was supposed to have its own ballast wire.

With that setup the car really stumbled to rev up and this was the cause of my original post.

Since I rewired it as per the diagram, using the ballast resistor that came with it, the revving has improved dramatically. So the coil now has a ballast, only it is the one supplied with the coil, since the white/pink wire has been cut.

A look under my dash revealed that there has been a lot of cutting and joining, the worst being bits of wire cover stripped off and another wire joined at this point. So I can imagine that the PO(s) may have done something to the ballast resistor wire unwittingly.

It revs nicely now with only a hint of hesitation. Coil is warm but not hot so it looks good.

Cheers

Mario

_________________
1972 Spitfire MK IV
1972 Stag
1980 Sprint

1962 Land Rover Series 2a
1961 Land Rover Series 2a (under restoration)
1983 Land Rover Series 3

1995 Suzuki Samurai SJ413

1972 MGB GT (banished for being too tight to fit in it)


Top
   
 Post subject: Re: Misfire Again
PostPosted: Wed Aug 16, 2017 11:29 am 
Offline
Future Club member hopefully!
Future Club member hopefully!
User avatar

Joined: Fri Jan 06, 2017 11:14 pm
Posts: 246
Quote:
Only replace the bypass feed to the coil if you have a different full voltage coil like a bosch blue or DLB105.

If you run a ballasted coil at full volts it will eventually fail and possibly take the lumenition with it.

Ok Ive now read back through the various posts and can see we have mostly correct information but its open to being interpreted incorrectly.
Its good you have a smoother running car, but I'm concerned you may now have a ballasted coil running at full volts. You do NOT want this. It WILL fail as Jeroen, myself and others have said. I'm now also a little uncertain as to how your car is wired up right now.

The safest thing is to re-instate all the original connections as they were when the car was made. So you want all the white and pink wires and white and other tracers (I think the grey one is for the rev counter and may be on the coil minus) on the coil plus, and the lead to the points from coil minus going to the distributor. I suspect this original lead is now replaced with the black lead to your lumenition. Leave that...its fine, leave that in place.

What happens is when you start the car your white pink wire supplies the higher voltage from the starter to the coil plus but ONLY when you have the key in the start position and the starter is turning. If you have an extra supply from the fuse box to the same coil plus connector you will have full battery volts when the ignition is on and this will damage/burn out your coil.

Now just take your lumenition red lead and join it to the fuse box white wire side as before. It MUST NOT go to any coil connection, only direct to the lumenition module.

Do all this and it should work fine.

Jonners
Jonners many thanks for this - on the basis that my understanding of English may not be the same as yours, can you articulate your comments in a diagram? I feel that you and I are now on the same page.

_________________
1972 Spitfire MK IV
1972 Stag
1980 Sprint

1962 Land Rover Series 2a
1961 Land Rover Series 2a (under restoration)
1983 Land Rover Series 3

1995 Suzuki Samurai SJ413

1972 MGB GT (banished for being too tight to fit in it)


Top
   
 Post subject: Re: Misfire Again
PostPosted: Wed Aug 16, 2017 1:07 pm 
Offline
Future Club member hopefully!
Future Club member hopefully!

Joined: Fri May 31, 2013 2:22 pm
Posts: 364
I known this may be a little late but I had problems of missing running one of these systems, the problems all went away when I took it off and went back to points and condenser.

One of the things I found whilst trying to resolve the issue was that the ballast wire was not working and was putting out 14.5 volts. In the end to make sure this was not causing further problems as belt and brasses I wired in a new supply from the fuse box and fitted a ballast to this to take everything back to a known original set up.


Top
   
Display posts from previous:  Sort by  
Post new topic  Reply to topic  [ 36 posts ]  Go to page Previous 1 2 3

All times are UTC+01:00


Who is online

Users browsing this forum: Jamesmannion, southfields and 30 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Limited