Question about JBL Boating

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My son and his buddy recently installed an amphlified stereo system on our center console and there is something strange going on that I can't figure out. It is a Clarion stereo with a JBL amp. The boat has two batteries and a Perko switch to go between them. All the other electronics on the boat (VHF, GPS, depht finder, etc) all work fine. The mystery is with the stereo. If you turn it on at the radio itself, it powers up (the display), but no sound. The amp does not automatically power up. Both the amp and the radio have separate direct lines to the spare battery. Everything else on the boat is powered off the primary battery via the Perko route. The strange thing is, if I disconned the ground strap between the two batteries, the stereo system comes on and will play fine. If I hook the ground strap back up while it is playing, no problems. But turn it off and try to turn it back on, no dice. Disconnet the ground and POOF, back in business. The + and - connections for the amp go directly to the battery on dedicated wire. The radio has a larger gauge "power" wire, a smaller "switched power" line, and a separate black ground wire. The two "power" wires are joined together and tied to a direct line to the battery. The ground also goes directly to the battery. The radio also has a blue "signal on/off" line that goes to the amp to turn it on and off based on what the radio is doing. That is also a separate line to the amp and appears to be working properly (when the ground strap between the two batteries is off anyway). Can you provide me with any idea of idea what this is or the steps I can take to trouble shoot it?

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  • greg_g_walla Jun 25, 2009



    I'm not sure how the ground difference works, but we'll give it a try. the radio + line does already have a fuse. We'll add a fuse to the amp + line and move the ground to another point.



    thanks

  • greg_g_walla Jun 25, 2009

    Yes . . . a marine battery is 12 volts like a car battery. The challenge for me in this is that since a boat is fiberglass and not steel, move of the other electrical circuits on the boat eventually tie into some cable or wire that eventually goes to the negative post. I can move the ground off the post directly, but I believe it will still be back there indirectly.

  • greg_g_walla Jun 25, 2009





    The stereo has two positive power leads . . . one is a larger "power" wire and the other is just labeled as a "switched power" line. The switche dline is supposed to be hooke dup to the ignition, or something so the radio can't play unless the accessory switch is on. Becasue my son wanted the radio to play regardless of whether the key was on or not, he wired both of these stereo power wires into the same hot wire coming from the battery. Do you think that this switch wire having power all the time could be causing the stereo to be "confused"?



    Thanks

  • blueextc3221
    blueextc3221 May 11, 2010

    Put the wiring to the primary battery - as the backup is just that - a backup for emergency starts. This will end your problem.

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The problem is simple if u were to read the JBL Powered Sub Manual. the JBL has a circuit that shuts down the amp if it detects a battery voltage of 10volts or less. with your two batteries strapped together its detecting the low voltage from your accessory battery rather than the full voltage of the secondary battery. fyi if u were to read the manual it does say to connect the black and red wires directly to your boats battery. id get a volt meter and with the boat and all its accessories running check the output voltage of each battery. which ever battery has over 10v thats where u want the amp hooked up....

Posted on May 14, 2012

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If a boat is anything like a car, the amp's negative post should not be connected to the battery, but to the ground of the boat. In a car, the entire chassis is grounded to the negative terminal, so when you run a line from the positive terminal of the battery to the positive post on the amp, and a line from the negative post on the amp to the chassis it is a complete circuit. I highly recommend placing a fuse on the positive line from the battery to the amp. Wiring this way prevents the amp from blowing up your battery, as well as prevents the battery from blowing your amp. Hope it works.

Posted on Jun 25, 2009

  • LetsFocus Jun 25, 2009

    I'm not 100% certain if it will work, but if not, I would say try searching Google or something online for marine audio hookup diagrams, you may be able to find something that will help you troubleshoot. Is a marine battery also 12V like a car battery?

  • LetsFocus Jun 25, 2009

    Well in a car, the whole thing is steel, so anywhere metal is connected to the battery, so connecting the amp to a metal part of the car is indirectly hooking it to the battery. I see what you mean, though, I have one other thought, and that is that there is a problem with the remote turn-on line. Once I had a stereo that didn't send out a remote turn on signal, I just ran a lead off the positive cable to the remote spot on the amp, with a switch so I could turn it on and off. I don't know if that will do anything, it doesn't seem like that would have anything to do with the problem since the amp does turn on sometimes. Sometimes electronics can act up at times, and things that hardly make sense end up solving the problem.

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