MSD ignition and welding Question

-
Mopower71

Mopower71

Speed Demon
Joined
May 31, 2004
Messages
2,183
Reaction score
39
Location
Poughkeepsie, N.Y.
I have to weld two brackets on to my roll cage for my seat bracket.
Should I remove the MSD box completely from the car, or just disconnect the wires and leave it mounted?
I don't want to fry the box, and I've heard welding can mess them up.
 
I read that just disconnecting the main positive + from the 12V battery source was all that was required to do welding. I have also done this with no ill affects to date on my digital MSD system
 
Mopower71 said:
I have to weld two brackets on to my roll cage for my seat bracket.
Should I remove the MSD box completely from the car, or just disconnect the wires and leave it mounted?
I don't want to fry the box, and I've heard welding can mess them up.
Click to expand...

Just Disconnect the (-) from the box, Remove the screws holding the box in place, Set it on cardboard (Insulate it)>>>..... And your all good......
 
all in all would you rather be safe then sorry or sorry then safe..

not that i wouldnt trust you guys on your opinions, and i have before and you never let me down, but wouldnt you be worried about other things too?

shouldnt he unhook MOST if not almost everything that is grounded to the car?

cant he get a surge protector for when he is welding and hook it up to his car somehow to reduce the chances?


Cerwin
 
I just installed a new section of rollcage in my car yesterday and I am running the MSD 6A box. I removed the - wires from the box and went to work. It was fine when I finished the job and hooked it back up. Cranked fine, ran fine. I didn't disconnect the battery at all..............
 
Here is a C/P from the MSD site.

When doing any welding, it always recommended to remove both the heavy red and heavy black from the MSD Unit, also as a precaution we also recommend the small red of the MSD Unit. Welding on a vehicle cause heavy power surges that could damage any electronic component.
Thanks,
msdtech2




Jack
 
Which is why you pull the neg cable off the battery. You can only get e surge if the circuit is complete. No negative on the battery, no circuit anywhere in the car.
 
Cerwin said:
You welded the car to a trailer?


wow.. talk about paranoid..

lol
Click to expand...
Yep :scratch:
Umm No. :tard:
Welded the seat back bracket to the roll cage. Then loaded the car on the trailer for todays test and tune.
This morning I go outside, and got wet. :sad1:
Guess I'll unload the trailer, clean the garage, and work on the "Honey Do List"
 
Disconect the negative battery post and you'll be doing more than I would, I am an ex-welder by trade (I went to school for it, worked in manufacturing for it for several years, and built race cars for a company for numorous years, I have never fried electrical anything so long as your ground is close to your work the current is going to flow between the ground clamp and electrode of the weld cicuit, path of least resistance. Roughly as shown in this simplistic drawing. Disconecting both positive and negative is best for welding noobs, least chance they will goof and run current thru expensive electrics, but not really necessary if you use common sense.

basic weld schematic.jpg
 
You must log in or register to reply here.
-

Back
Top