reedal Posted June 2, 2015 Report Share Posted June 2, 2015 If you have a DMM use it to measure voltage at the amps inputs. In both cars. I know the knob is at the amp but that doesn't mean it's accurate enough to keep up with the way music changes Get a clamp rated for at least 300A in your case, attach the clamp to the alternator positive and measure the current your alternator outputs. You have access to the positive from the alt right? 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...
reedal Posted June 2, 2015 Report Share Posted June 2, 2015 Double post 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...
Mr DeeBeez Posted June 2, 2015 Author Report Share Posted June 2, 2015 It will be very difficult to get to the alt positive. When looking down at the engine, you can BARELY see the pulley. Maybe from going under the car I can. And is the clamp something I can go to orileys or auto zone and they would be able to test it? Or are they fairly affordable to buy? Fi Team 18's (4) Crossfire 16k Crossfire 400.4 & 800.4 Pioneer AVH-X491bhs 140ah cmax CES 320's (2) Link to comment Share on other sites More sharing options...
reedal Posted June 2, 2015 Report Share Posted June 2, 2015 You have a positive going to your battery right.....? You have zero access to your battery? 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...
Ahmed Johnson Posted June 2, 2015 Report Share Posted June 2, 2015 You clamp the power going to the battery. Do you have two ground runs to the back or at least one? Link to comment Share on other sites More sharing options...
Mr DeeBeez Posted June 2, 2015 Author Report Share Posted June 2, 2015 Ok, yes I do have a positive to the battery Sorry I thought you meant it had to be at the alt. But I can clamp to power wire coming from the alt. and I don't have any negative runs going to the back. I have 2 runs of grounds going from batteries in back to the frame. Do I need to have a run from front negative to back negative? Fi Team 18's (4) Crossfire 16k Crossfire 400.4 & 800.4 Pioneer AVH-X491bhs 140ah cmax CES 320's (2) Link to comment Share on other sites More sharing options...
Ahmed Johnson Posted June 2, 2015 Report Share Posted June 2, 2015 If you need 2 runs of power, hell yeah. Disconnect one of those power wires and make it a ground. Link to comment Share on other sites More sharing options...
Mr DeeBeez Posted June 2, 2015 Author Report Share Posted June 2, 2015 Well shit. Now that I have the power wired cut to length, I don't know if I it will be long enough to reach the negative of the battery. Would it be ok if I extend a wire by having both ends have a lug crimped on, then bolt them together? Fi Team 18's (4) Crossfire 16k Crossfire 400.4 & 800.4 Pioneer AVH-X491bhs 140ah cmax CES 320's (2) Link to comment Share on other sites More sharing options...
reedal Posted June 2, 2015 Report Share Posted June 2, 2015 Just add another run. Keep both positive and add another run for a negative 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...
Mr DeeBeez Posted June 2, 2015 Author Report Share Posted June 2, 2015 Ok. And just out of curiosity, what is the difference between running a negative run, and just grounding to the frame? Fi Team 18's (4) Crossfire 16k Crossfire 400.4 & 800.4 Pioneer AVH-X491bhs 140ah cmax CES 320's (2) Link to comment Share on other sites More sharing options...
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