Stick Welder Repair

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I know a lot of you repair old welders for fun so I thought I would see if you any of you have some advice. I have an old Dayton 230/140 AC/DC arc welder. It worked fine. I went through and replaced all the terminals with dinse style lugs I bought off eBay. Now the welder turns on, but I'm pretty sure it's shorting out inside the unit. When I turn it off, the switch sparks on the inside and it won't even start an arc trying to weld. I popped it open again and don't see any wires or lugs touching  and there's not burn marks but there is definitely something wrong. It's also making a lot more noise than it used to, similar to when stick welding and the rod sticks.John 3:16(2) Miller Pheonix 456(2) Millermertic 252Dynasty 210DXHobart 210MVPDoringer D350 SA Cold SawScotchman 350LT Cold SawWebb 10x50 MillWebb 15x40 LatheGeka Bendicrop Ironworker
Reply:I would check to see if one of you're new plugs is shorted to the case. Check with a ohm meter from wire to the case       "Un plug it first"DanManipulator Of Metal
Reply:Oh I'm an idiot. That's got to be what it is. Now that I'm thinking about it, the original plugs had a plastic shell that fit inside the hole cut out of the case to keep the bolts from contacting the metal. Will electrical tape be good enough? I don't think the shell will fit with the new plugs.John 3:16(2) Miller Pheonix 456(2) Millermertic 252Dynasty 210DXHobart 210MVPDoringer D350 SA Cold SawScotchman 350LT Cold SawWebb 10x50 MillWebb 15x40 LatheGeka Bendicrop Ironworker
Reply:Electrical tape would not be my first choice. There should have been some kind of isolation bushing you can use or make one. DanManipulator Of Metal