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Old 04-10-2012, 04:13 PM
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DaveInDenver DaveInDenver is offline
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Originally Posted by Red_Chili View Post
I bet it has nothing more than a bunch of MOVs and such.
What do you think the OTC widget has in it? It ain't rocket surgery.
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Old 04-10-2012, 04:29 PM
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Red_Chili Red_Chili is offline
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Yeah, my comment was really about all of them. OK Dave, throw together a parts list of appropriate MOVs and/or other varistors and let's source and build them! RS fundraiser??

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Old 04-11-2012, 11:12 AM
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Most of the COGS is going to be in the cables and clamps. MOVs are like $0.50 or so, solid state TVSs will vary depending on power rating, but they're still pretty cheap. Most of the price (as opposed to COGS) is going to be in the markup. Specialty electronics devices (as opposed to commodity stuff) are typically around 70-90% margin.
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Old 04-11-2012, 09:39 PM
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ive never had a issue when welding on motor vicheals. ive done tons of fab and repairs to this current truck and never had a issue or even though twice about it. because its direct current the flow will always take the path of liest resistance. same circumstance as the car getting hit by lightning, car keeps running.

Originally Posted by Red_Chili View Post
I've welded repeatedly to the Chili and others with no concern for the ECM. I would NOT disconnect the battery... it acts as a clamping device. Think, capacitor. Shunts spikes to some degree. We are dealing with low voltages, but much current/ inductance. Operate accordingly.

Ground very close to your work and make sure you know what is near the welding location. Do NOT drape welding cables over anything, induction is real.


Originally Posted by Rezarf View Post
All this and no one has asked "Nak, whatcha' welding man?" I am interested in what you are up to?
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