1993 Harley Davidson FLSTF Fat boy Logo
T
Tom Gleason Posted on Jun 08, 2015
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Why won't it start?

Bought new bat. for 93 Fat Boy and the polarity was reverse and I hooked up just enough to see the bat. cable heat welded to the bat.term.. Now it is not charging the brand new bat.WTF did I fry ? AGM Fully charged it yesterday.Rode it and now theres no power to start.I think it is kinda obvious that something got fried? What would be the most likely component or components that got fried?

1 Answer

gbob59

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  • Harley Davidson Master 3,063 Answers
  • Posted on Jun 08, 2015
gbob59
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Joined: Feb 17, 2008
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I'd look for a major fuse, switch, Relay Melted wires or insulation. So the battery drained overnight? Which indicates a bad short somewhere. I like to use the new led bright flashlight to do a through inspection of the wiring system in the dark.

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My 04 Explorer I hooked up battery cables backwards...now I have dash lights everything works but won't start

heat sync ??? if you dont trust mech answer get a second opinion or check fuses --relays--inertia switch then with a meter start testing starting system for damage or failure
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Change polarity on older mac mig welder

https://www.youtube.com/watch?v=_yTnfRS9B04

So, for gasless MIG welding polarity (when using flux core wire), your MIG welding polarity settings should be set to direct current electrode negative (or DCEN). With DCEN, the negative terminal inside your machine is hooked up to your electrode (your MIG gun) while the positive terminal is hooked up to your ground.

https://makemoneywelding.com/how-to-set-your-mig-welding-polarity-settings/



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What settings do i use to arc weld.

Not sure what machine you have, but it should be DC straight (electrode negative or DCEN) and DC reverse (electrode positive or DCEP). The polarities have different characteristics. For example, if you're planning to TIG weld, you would either use DCEN or AC (if welding aluminum). For the general stick welding process, DCEP tends to give you a deeper weld. The welding rod you buy will have recommended machine polarity and amperage range settings, you should use the recommended polarity for whichever rod you're using because different rods are designed to weld under different circumstances. But, generally speaking, most welding rods for steel will work on DCEP without much trouble.
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Do I need to reverse the polarity for using Flux core wire

I have not heard that it is necessary or desirable.

It could be most undesirable as reversing the polarity would put approximately two-thirds of the heat into the torch instead of into the work.

This could be suitable for some delicate welding tasks but unless the torch is water-cooled only very short duration welds will be possible.
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Hooked up battery backwards now engine isn't

No. Replace the Engine control unit that was destroyed when you reversed the polarity to it.
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I just bought a AC225 stick welder, there are two cables coming out of the machine, I don't know which one is the work cable and which one is the holder cable?

it doesn't matter which one you use because it's alternating current, normally the longer one is your electrode holder cable so you have more cable to move around with,but either way it will work, if it's a D.C. welder then all your doing is using reverse polarity and in some cases welding this type of welding is superior to straight polarity
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My 93 Fat Boy sat for awhile and wouldnt start

I don't want to sound like "Chicken Little" here. I would in light of the potential possible issues strongly recommend taking your bike to shop you are comfortable with.
You just asked for what we think, the number of items that could be damaged are long, and with the bike sitting up for a while you may have other items that would need to be addressed to get it going. This may be one of those times where dropping it off at the shop is the best thing to do.
Hope this helps,


JP
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