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msd problem
http://www.woodsbuggy.com/phpBB3/viewtopic.php?f=3&t=442		 Page 1 of 1
Author:  plumberbill [ Wed May 09, 2007 10:50 am ]
Post subject:  msd problem
running a msd 6a and msd dizzy.when i turn off the ign. the motor runs 3 to 5 sec. after shut down. this only happens when the motor is warmed up. msd had me put a diode on the wire to the dummy light and tee a ballest resistor in line with the switched power to the msd. still have the same problem.
Author:  Roy [ Wed May 09, 2007 11:00 am ]
Post subject: 
The only thing I can think of is the diode in the charging light circuit is installed backwards. I feel the problem lies in this area. I can't see where using a resistor to the main power for the MSD box would do anything. Actually I think it would hurt you.
Try pulling your fan belt off and firing the motor up for a second and turn it off. See if it still does it with the belt removed.

Roy
Author:  plumberbill [ Wed May 09, 2007 11:16 am ]
Post subject: 
diode is installed with the silver ring towards the alt. per msd
ign. switch has been replaced
Author:  billykissell [ Wed May 09, 2007 11:24 am ]
Post subject: 
try a fuel shut-off solenoid? i know this is fixing the symptom, but a good safety feature to boot.
Author:  Odyknuck [ Wed May 09, 2007 12:34 pm ]
Post subject: 
A fuel shut off solinoid will not help this problem. You still have float bowls full of gas.
Author:  kybuggy1 [ Wed May 09, 2007 1:06 pm ]
Post subject:  Re: msd problem
[quote='plumberbill']running a msd 6a and msd dizzy.when i turn off the ign. the motor runs 3 to 5 sec. after shut down. this only happens when the motor is warmed up. msd had me put a diode on the wire to the dummy light and tee a ballest resistor in line with the switched power to the msd. still have the same problem.[/quote]

Do you have any accesories or lights or anything wired to your alternator? In other words, did you used it as a place to pick up 12 volts for something? If
Author:  Odyknuck [ Wed May 09, 2007 3:02 pm ]
Post subject: 
MSDs logic on the ballast resistence was to take the power to ground when it was turned off. Its in parrellel not in series with the power feed.
Author:  gustograber [ Wed May 09, 2007 5:21 pm ]
Post subject: 
i`ve seen that happen when the fan on the oil cooler was hooked to the coil so it wood run whenever the key was on.
Author:  DVS1 [ Thu May 10, 2007 12:45 am ]
Post subject: 
Like Gusto said. But I can tell you from personal experience, I had everything on one wire ign,fuel and fan for the oil cooler. And when I shut the power off the fan would act like a generator and powered the ign for a few seconds. My solution was, I put everything one it's own power lines. But if you have a fan and put the diode on the fan power line that should solve the problem. Good luck!
Dave
Author:  plumberbill [ Thu May 10, 2007 8:08 am ]
Post subject: 
all accessorys are on there own seperate fused circut
Author:  railridernky [ Thu May 10, 2007 7:31 pm ]
Post subject: 
install a diode between alt light an voltage reg that will take care of it. been there done that. 15 or 20 cents at r.shack
Author:  kybuggy1 [ Thu May 10, 2007 10:48 pm ]
Post subject: 
Wes, I think he already did that.

[quote='plumberbill']diode is installed with the silver ring towards the alt. per msd
ign. switch has been replaced[/quote]

Larry
Author:  railridernky [ Sat May 12, 2007 11:45 am ]
Post subject: 
must of had a brain malfunction. sorry
Author:  kybuggy1 [ Sat May 12, 2007 12:14 pm ]
Post subject: 
LOL! :lol:
Author:  plumberbill [ Mon Jul 30, 2007 10:13 am ]
Post subject: 
found out what the problem was, thanks to odyknuck who found a post on the samba. turns out i installed a new oil cooler with a fan, when the fan shuts down it back feeds a charge which appearently is enough to keep the ign. running for a few seconds. what made this a little more confusing is that i installed a thermostatic switch inline so the only time the problem appeared was when the oil temp got to 165deg. and kicked the fan on. simple fix, just had to install a diode on the power supply to the fan to keep it from back feeding. im really suprised that when i called msd tech support they never brought this up. sorta reminds me of going to the auto parts store, nobody thinks oudside the box.
Author:  Odyknuck [ Mon Jul 30, 2007 10:26 am ]
Post subject: 
Bill,Read DVs,s post above yours about his oil cooler fan
Author:  plumberbill [ Mon Jul 30, 2007 9:02 pm ]
Post subject: 
[quote='DVS1']Like Gusto said. But I can tell you from personal experience, I had everything on one wire ign,fuel and fan for the oil cooler. And when I shut the power off the fan would act like a generator and powered the ign for a few seconds. My solution was, I put everything one it's own power lines. But if you have a fan and put the diode on the fan power line that should solve the problem. Good luck!
Dave[/quote]
i swear his post didnt say anything about a diode on the power
Author:  Odyknuck [ Tue Jul 31, 2007 2:44 pm ]
Post subject: 
Thats his story and he's sticking to it! :lol:
Author:  DVS1 [ Tue Jul 31, 2007 3:38 pm ]
Post subject: 
Yeah, I was going to say something but i'll keep my mouth shut.
Author:  plumberbill [ Wed Aug 01, 2007 8:30 am ]
Post subject: 
just my attention deficit disorder kicking in
Author:  bruce 1 [ Mon Aug 13, 2007 4:33 pm ]
Post subject: 
where did you get the Diod? and what kind brand etc? Thanks
Author:  kybuggy1 [ Tue Aug 14, 2007 9:01 am ]
Post subject: 
My new MSD box for my wife's buggy came with one, but I got one at Radio Shack for my old MSD box that I put on my buggy. Just asked them for a one way diode and the guy took me right to it.

Larry
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