rockFord_Expedition Posted August 26, 2015 Report Share Posted August 26, 2015 I would go for a thicker piece of metal. I always aim for frame or strut tower depending on vehicle. You will also want more metal to metal contact. Those lugs arent ideal and I definitely wouldnt stack them. Old School/New School RF Build March 2015 SOTM Winner How to crimp large wire Link to comment Share on other sites More sharing options...
Guest Posted August 26, 2015 Report Share Posted August 26, 2015 how should i go about rectifying this ? best options ? personally I like one of these welded to a good spot http://www.knukonceptz.com/mobile-audio/installation-accessories/set-screw-terminals/sp/set-screw-40-gauge-ring-terminal-ground-lug/ You can weld aluminum to steel? no but you can weld the tin coating :hi: :hi: :hi: :hi: Link to comment Share on other sites More sharing options...
dolarbilz Posted August 26, 2015 Report Share Posted August 26, 2015 how should i go about rectifying this ? best options ? personally I like one of these welded to a good spot http://www.knukonceptz.com/mobile-audio/installation-accessories/set-screw-terminals/sp/set-screw-40-gauge-ring-terminal-ground-lug/ You can weld aluminum to steel? no but you can weld the tin coating :hi: :hi: :hi: :hi: That tin coating micron thin..heat alone from welding would burn it off.if then you could weld the two together.more like make a melting pot mess hopefully it puddles together.then during cool down process the aluminum will cool faster leaving probably to crack or pop off. Link to comment Share on other sites More sharing options...
snafu Posted September 8, 2015 Report Share Posted September 8, 2015 You cannot use a DMM to measure resistance between two points to determine a low resistance ground. Any reading gleaned with a DMM is meaningless. Tony Candela - SMD Sales & Marketing Email me at [email protected] to learn about becoming an SMD Partner! Link to comment Share on other sites More sharing options...
Broke_Audio_Addict Posted September 8, 2015 Report Share Posted September 8, 2015 Care to explain why? It's what I've always seen said to do doesn't mean it's right but Im interested to know why it's not. That being said a lot of people's definition of "music" is a clipped 30 hz sine wave with some 80 IQ knuckle head grunting about committing crimes and his genitals. Link to comment Share on other sites More sharing options...
snafu Posted September 9, 2015 Report Share Posted September 9, 2015 The answer is in that video. You have to: - Measure voltage drop with a DMM between the charging system negative (-) and the proposed location under load (say your amps draw 500A continuously, then you need a 500A carbon pile load to simulate this) You would connect the carbon pile load across the main power lead AND to the proposed grounding location - Measure current during the voltage drop test - Compute the actual resistance via Ohm's Law - Vdrop / Current = Actual Resistance For example. Let's say you develop a 1V drop Between the seat bolt and the case of the alternator when applying a 500A load across the amp power lead and proposed location with the vehicle running. The math is as follows: 1V / 500A = .002 Ohms Tony Candela - SMD Sales & Marketing Email me at [email protected] to learn about becoming an SMD Partner! Link to comment Share on other sites More sharing options...
snafu Posted September 9, 2015 Report Share Posted September 9, 2015 BTW, who can tell me whether .002 Ohms denotes a "good" ground for this scenario. You need more information to determine the answer . . . DCV measured at the alternator while applying the 500A load is 13V. Go. Tony Candela - SMD Sales & Marketing Email me at [email protected] to learn about becoming an SMD Partner! Link to comment Share on other sites More sharing options...
reedal Posted September 9, 2015 Report Share Posted September 9, 2015 if you're able to supply the 500A, and voltage doesn't drop any lower than 13, I don't see why it wouldn't be a good ground. If you used it for your equipment instead of the carbon pile load, and the equipment has no issues staying powered, and no decrease in operating power given its drawing a constant 500A, then it's a good ground. Just my opinion. SMD Tool Map https://www.stevemeadedesigns.com/board/topic/193176-smd-tool-map-new-november-2014/ Build log https://www.stevemeadedesigns.com/board/topic/197217-reeds-03-tahoe-hat-sqaq-singer-xs-shca-cockbox-80prs/?page=32 Link to comment Share on other sites More sharing options...
zxsonnyxz Posted September 9, 2015 Report Share Posted September 9, 2015 0.002ohm is equivalent to a 2awg wire without heat from what i understand, so for 500a that's not good enough. Also with 1V drop from just ground path alone that's a big drop. I remember seeing a vid some time ago, brobably the one you mentioned. Didn't watch it now but found the text and in that test it equaled a litte more than a 14' 1/0 ofc wire. So down to about 0.0012ohm in that car I think? Almost halve and would make quite a difference. But not even that wont support a 500a load in a good way. That's how I see it STD Passat Build 151db+STD Omega BuildMitsubishi Colt Build - Alpine|Focal|PeerlessHome Stereo BuildSmall Tang Band build - 4" fullrangeBox for 4 8"My Saab 9000 Build- I'd be very happy if you cared to check out the logs and give feedback! Link to comment Share on other sites More sharing options...
snafu Posted September 9, 2015 Report Share Posted September 9, 2015 1V / 13V = .077 or 7.7% . . . Tony Candela - SMD Sales & Marketing Email me at [email protected] to learn about becoming an SMD Partner! Link to comment Share on other sites More sharing options...
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