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Vehicle Jerks to Subwoofer Beat While Accelerating
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<blockquote data-quote="Jasdip" data-source="post: 8651813" data-attributes="member: 675380"><p>Ok, so I did some testing with a good friend of mine (whose pretty good with sound systems and electrical stuff) and here is what we found:</p><p></p><p>With the sound system off:</p><p></p><p>Battery: 14.3v</p><p></p><p>Amplifiers, capacitor, circuit breaker: about 14v</p><p></p><p>With sound system on and bass turned to full and volume blasted (lowest values which were hit):</p><p></p><p>Battery: 13v</p><p></p><p>Rear Fuse Panel: 11.2v</p><p></p><p>Amplifiers: under 12v (between 11-12)</p><p></p><p>We also noticed that the system was installed with a 4 gauge wire which was not even independently run to the battery in the front, it is piggy-backing off the rear fuse box power which also has a 4 gauge running to the battery. When I was at land rover today, the service manager confirmed that everything behind the fuel tank and a lot of stuff related to fuel pumps, injectors, etc. are controlled from that box and it's basically a small computer which also needs power and, as we suspected, that could likely be causing the jerking.. See image: <a href="https://www.dropbox.com/s/wwku1vfuj10kdc2/IMG_9160.JPG?dl=0" target="_blank">https://www.dropbox.com/s/wwku1vfuj10kdc2/IMG_9160.JPG?dl=0</a></p><p></p><p>The service manager did say that people normally run a second battery in those trucks.. and the Bentley's and others come stock with 2 batteries as well and one runs the electronics..</p><p></p><p>My friend said that he feels that the capacitor is probably shot as well and replacing that with a higher powered one (he suggests 10 or even 20 farad, even though I think a 3 farad would suffice) may help with the issue but recommends also running a 0 gauge power wire to the battery (adding a second battery is ideal of course but that is way too much more work/cost)..</p><p></p><p>Let me know your thoughts..</p></blockquote><p></p>
[QUOTE="Jasdip, post: 8651813, member: 675380"] Ok, so I did some testing with a good friend of mine (whose pretty good with sound systems and electrical stuff) and here is what we found: With the sound system off: Battery: 14.3v Amplifiers, capacitor, circuit breaker: about 14v With sound system on and bass turned to full and volume blasted (lowest values which were hit): Battery: 13v Rear Fuse Panel: 11.2v Amplifiers: under 12v (between 11-12) We also noticed that the system was installed with a 4 gauge wire which was not even independently run to the battery in the front, it is piggy-backing off the rear fuse box power which also has a 4 gauge running to the battery. When I was at land rover today, the service manager confirmed that everything behind the fuel tank and a lot of stuff related to fuel pumps, injectors, etc. are controlled from that box and it's basically a small computer which also needs power and, as we suspected, that could likely be causing the jerking.. See image: [URL="https://www.dropbox.com/s/wwku1vfuj10kdc2/IMG_9160.JPG?dl=0"]https://www.dropbox.com/s/wwku1vfuj10kdc2/IMG_9160.JPG?dl=0[/URL] The service manager did say that people normally run a second battery in those trucks.. and the Bentley's and others come stock with 2 batteries as well and one runs the electronics.. My friend said that he feels that the capacitor is probably shot as well and replacing that with a higher powered one (he suggests 10 or even 20 farad, even though I think a 3 farad would suffice) may help with the issue but recommends also running a 0 gauge power wire to the battery (adding a second battery is ideal of course but that is way too much more work/cost).. Let me know your thoughts.. [/QUOTE]
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