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JL Amp not powering up

Old 03-12-2017, 05:40 PM
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Default JL Amp not powering up

Hello everyone... Any input or direction is greatly appreciated.

I have installed a new head unit (Fusion MS‑UD750) in my 2008 Albemarle 290 XF which I am using to directly power two speakers in the cabin and two speakers at the helm. Both of these zones were existing and and I just upgraded the speakers (JL MX650). Added the remote at the helm and all works perfect....

Enter the problem... For my third zone in the cockpit I added two more speakers (JL MX650) that are being powered by an amp (JL Audio MHX280/4) which I configured and wired to a bridged 2 channel set up. I am having trouble getting power to the amp. Initially It was wired to a major bus panel behind the helm but I received no power to the amp other than when I turned on the wipers it would turn on intermittently. Can you imagine the comical, puzzled look on my face all alone in a shrink wrapped boat in 30 degree weather?? ;?

***One thing to note is that the boat is winterized and I only had one of three batteries hooked up.

Since then I have taken the advice I received from reading discussions on here and talking to a few others and have connected the amp directly to the battery. Still nothing. At that point I disconnected the blue amp turn on wire from the head unit and connected it directly to the to the same battery that the amp was connected to. This worked and it powered the amp.

My first set of questions: Has any one else experienced this? Is it a setting on the Fusion Head Unit that I am not turning on? The wire was a 16 gauge coming off the amp and the head unit but I used a 14 gauge to make the connection. I would think using a thicker gauge should not be a problem. Or is this my issue?

My second set of questions: While I was incredibly impressed on how good the sound was (both powerful and clear) I realized that the majority of the sound if not all was coming just from one speaker. This is most likely an easy fix just need to go back and retrace my steps and wiring. Any input here also appreciated.
Old 03-12-2017, 06:17 PM
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sounds like it could be a bad deck? or maybe the wrong wire on the deck? measure the voltage on the blue wire. should be 12v when deck is on. try it when disconnected from amp, and while connected.

in the fusion you can turn the internal amps off, or zones off. I'm pretty sure you can't turn the blue wire off. I don't think it's a setting issue.
Old 03-12-2017, 06:37 PM
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Old 03-12-2017, 07:21 PM
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Thank you for the reply smac. I was already planning on doing that. Will bring my volt meter with me next weekend.
Old 03-12-2017, 09:02 PM
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If other amplifiers are turning on via the same remote lead, and you have three total amplifiers or at least three items triggered by the HU remote lead, then it could be time to add an interrupt relay. Amplifiers don't all have the identical turn-on voltage threshold. And HU remote circuits are usually limited to 0.15 volt draw (to be safe). In the scenario described, it's important that all amplifiers and the HU access the same physical ground point, and the same with the physical positive point...all of which contributes to the component by component voltage level. The wiper issue would be a pretty clear indication of a wiring problem, and not an equipment problem. I'm questioning the ground.
Old 03-12-2017, 09:33 PM
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David, Definitely some insightful and in depth thoughts. Thank you. The other two zones are powered by the head units internal amp not separate amps though. I solved the wiper issue by going direct to the battery.
Old 03-12-2017, 10:10 PM
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Originally Posted by Egrzan View Post
Hello everyone... Any input or direction is greatly appreciated.

I have installed a new head unit (Fusion MS‑UD750) in my 2008 Albemarle 290 XF which I am using to directly power two speakers in the cabin and two speakers at the helm. Both of these zones were existing and and I just upgraded the speakers (JL MX650). Added the remote at the helm and all works perfect....

Enter the problem... For my third zone in the cockpit I added two more speakers (JL MX650) that are being powered by an amp (JL Audio MHX280/4) which I configured and wired to a bridged 2 channel set up. I am having trouble getting power to the amp. Initially It was wired to a major bus panel behind the helm but I received no power to the amp other than when I turned on the wipers it would turn on intermittently. Can you imagine the comical, puzzled look on my face all alone in a shrink wrapped boat in 30 degree weather?? ;?

***One thing to note is that the boat is winterized and I only had one of three batteries hooked up.

Since then I have taken the advice I received from reading discussions on here and talking to a few others and have connected the amp directly to the battery. Still nothing. At that point I disconnected the blue amp turn on wire from the head unit and connected it directly to the to the same battery that the amp was connected to. This worked and it powered the amp.

My first set of questions: Has any one else experienced this? Is it a setting on the Fusion Head Unit that I am not turning on? The wire was a 16 gauge coming off the amp and the head unit but I used a 14 gauge to make the connection. I would think using a thicker gauge should not be a problem. Or is this my issue?

My second set of questions: While I was incredibly impressed on how good the sound was (both powerful and clear) I realized that the majority of the sound if not all was coming just from one speaker. This is most likely an easy fix just need to go back and retrace my steps and wiring. Any input here also appreciated.
Problem one is pretty simple. You only have one batt hooked up. You have a lot of things that are not connected. Your ground are not connected and shared. You have a lot oif things that can not complete a circuit causing all kind of weird crap to happen.
The blue wire on back of fusion goes to amp blue. Turn on HU amp turns on.
As to why one speaker is louder check the obvious which is that the fader on your fusion is in the middle and wiring is correct. Check amplifier gains and make sure one is not set higher then the other.
Old 03-12-2017, 10:11 PM
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The wiper issue was when that stereo circuit was not properly grounded via a path to the battery and you completed a circuit once the wipers were activated.
All terminations tight?
Poor voltage. Poor ground. Basically the same problem. There lies your focus for now.
Check the voltage with a multimeter under load at the operational device rather than the static voltage at the battery.
Old 03-12-2017, 10:13 PM
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Originally Posted by David Analog View Post
The wiper issue was when that stereo circuit was not properly grounded via a path to the battery and you completed a circuit once the wipers were activated.
All terminations tight?
Poor voltage. Poor ground. Basically the same problem. There lies your focus for now.
Check the voltage with a multimeter under load at the operational device rather than the static voltage at the battery.
Re read his op. He has only one batt actually hooked up. You know what that means.
Old 03-13-2017, 03:47 AM
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Originally Posted by Dockholiday74 View Post
Problem one is pretty simple. You only have one batt hooked up. You have a lot of things that are not connected. Your ground are not connected and shared. You have a lot oif things that can not complete a circuit causing all kind of weird crap to happen.
The blue wire on back of fusion goes to amp blue. Turn on HU amp turns on.
As to why one speaker is louder check the obvious which is that the fader on your fusion is in the middle and wiring is correct. Check amplifier gains and make sure one is not set higher then the other.
Dock,

Thanks for the reply. I am thinking you're right. It's the only explanation in why my first hook up did not work/power up properly. You've inspired me to lug all 3 batteries to the boat and hooked up.
Old 03-13-2017, 06:03 AM
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Originally Posted by Egrzan View Post
Dock,

Thanks for the reply. I am thinking you're right. It's the only explanation in why my first hook up did not work/power up properly. You've inspired me to lug all 3 batteries to the boat and hooked up.
Once the electrical is back to its baseline then you can do your install and know whats what.
Old 03-13-2017, 06:52 AM
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Originally Posted by Egrzan View Post
Dock,

Thanks for the reply. I am thinking you're right. It's the only explanation in why my first hook up did not work/power up properly. You've inspired me to lug all 3 batteries to the boat and hooked up.
or lug one batt
and hook all leads to it
Old 03-13-2017, 06:56 AM
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Originally Posted by moonzy1 View Post
or lug one batt
and hook all leads to it
Even better! You're a smart man moonzy.
Old 03-13-2017, 07:15 AM
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Doc is spot on. He beat me to the punch.
Old 03-22-2017, 06:57 PM
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any updates?
Old 03-23-2017, 08:34 AM
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Thank you to al the replies.

DocHoliday, you were spot on with needing to connect all the batteries to complete the circuit in order for everything to work properly. Im still not 100% sure as to why if there is an isolated house battery and I'm connected to it why I need the others connected. I am assuming it is because I needed to complete the circuit of where I was grounding. Even the blue wire amp/remote power up wire worked with no issues once I connected the batteries.

Moonzy, Great thought on just lugging one battery instead of three to the boat and connecting them all with jumper cables! You saved me some extra work.

Finally the last issue I had was one speaker being louder than the other. Previously I checked all the connections and the fader on the head unit. Those weren't the issues. The issue ended up being the settings on the amp. While I thought of that previously and also checked them I did not do it properly. It was a 4 channel amp that I bridged to a 2 channel amp using the "front" channels. First time around I only checked settings of the front channels and disregarded the "rear" two channels since in my head I wasn't using them. I was wrong. I was using them! Changed the settings on the rear channels and worked perfect.

With that behind me... moving onto bottom paint this weekend with potential 65 degrees in NY on Saturday.

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