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Weird Issue with popping system?
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<blockquote data-quote="Lasherž" data-source="post: 8703930" data-attributes="member: 679555"><p>Yeah man, that sounds like the light bar may be a bit too much for your battery. If it's as many amps as you say it is I have no doubt it'll cause enormous voltage drops. Car amps draw huge currents too, but not constantly like that light bar. I'd never use it when the car is off, but I'm curious just how big of a drop you're experiencing. If it's too much then you may not need the cap, it may be more prudent to just go right to a second battery or at the very least an AGM. I'm betting your alternator is damn near maxed out when the bar is going, so I'm not surprised there's a little whiplash when the load suddenly disappears.</p><p></p><p>My head unit used to malfunction at like 10v, so that's a pretty crazy amount of drop. The second battery wouldn't help a ton with your spike issue when you turn the bar off, but it will affect it so I don't think there's any point in trying to address that before the voltage drop problem.</p><p></p><p>Another thing I just thought of is if the cabling for the light bar or the relay is too close to an RCA it could cause that pop as well. The relay is a solenoid magnet so it's going to affect an RCA signal through any shielding when it switches on and off and the cable going to the light bar is also generating a small EMF.</p></blockquote><p></p>
[QUOTE="Lasherž, post: 8703930, member: 679555"] Yeah man, that sounds like the light bar may be a bit too much for your battery. If it's as many amps as you say it is I have no doubt it'll cause enormous voltage drops. Car amps draw huge currents too, but not constantly like that light bar. I'd never use it when the car is off, but I'm curious just how big of a drop you're experiencing. If it's too much then you may not need the cap, it may be more prudent to just go right to a second battery or at the very least an AGM. I'm betting your alternator is damn near maxed out when the bar is going, so I'm not surprised there's a little whiplash when the load suddenly disappears. My head unit used to malfunction at like 10v, so that's a pretty crazy amount of drop. The second battery wouldn't help a ton with your spike issue when you turn the bar off, but it will affect it so I don't think there's any point in trying to address that before the voltage drop problem. Another thing I just thought of is if the cabling for the light bar or the relay is too close to an RCA it could cause that pop as well. The relay is a solenoid magnet so it's going to affect an RCA signal through any shielding when it switches on and off and the cable going to the light bar is also generating a small EMF. [/QUOTE]
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