Amp turns off... still


Spazz131

CarAudio.com Recruit
Mar 10, 2021
41
3
Michigan
Okay here we go again. My amp will turn off, when the bass hits, but only if the bass hits well im accelerating. I've checked grounds quite a bit but will gladly do so more, I've installed big 3, a nice battery, and a HO alternator. I'm using a PRX1000.1 Memphis Amp, with 2 10in 600Watt alpine-s, and a jensen 500watt 4chan powering 4 alpine type-R. I'm confused as hell, and really don't know where to go next. To make things even weirder it sometimes works flawlessly where as sometimes i literally have to turn my gain down to make it even function or else it just keeps power cycling. Sometimes both amps restart, and sometimes If I have A.C going, even that cycles. To me it sounds like a grounding issue. My truck is a 2008 f150. Any ideas?
 

Kickstand

CarAudio.com Veteran
Jan 1, 2021
680
188
Maple Ridge
I think you might have a short somewhere .
No necessarily in the stereo equipment.
What is with the F150's
My brother has one, 2014
When I borrow it I can't use my Radar Detector
Everytime I hit the gas the "Laser" warning goes nuts
 

Spazz131

CarAudio.com Recruit
Mar 10, 2021
41
3
Michigan
  • Thread Starter Thread Starter
  • #4
That's what I was thinking too, ground, or a short. It's so weird. They have some weird electrical issues
 

AnthonyO

CarAudio.com Veteran
10+ year member
Oct 18, 2005
2,757
95
Minot, North Dakota, United States
If your ac is cycling, you’re losing voltage. I would say your dropping pretty low. Those Memphis amps are voltage hogs.
 

Spazz131

CarAudio.com Recruit
Mar 10, 2021
41
3
Michigan
  • Thread Starter Thread Starter
  • #6
If your ac is cycling, you’re losing voltage. I would say your dropping pretty low. Those Memphis amps are voltage hogs.
Would a short cause it a.c to cycle as well? When it happens the amp will spike to 15.3 to 16.4v
 

AnthonyO

CarAudio.com Veteran
10+ year member
Oct 18, 2005
2,757
95
Minot, North Dakota, United States
No. Sounds like the amp is pulling the voltage. That’s why it’s peaking.
 

Kickstand

CarAudio.com Veteran
Jan 1, 2021
680
188
Maple Ridge
If your amp is hitting 16 then I would agree AnthonyO
Just for my own curiosity, what size fuse do you have on the amp
If the amp is enough power to shut down other electrical components you would think it would blow the fuse
Stranger things have happened though
 

2RZ-FE

Senior VIP Member
10+ year member
Mar 14, 2011
633
129
Dixon, Ca
I would check your remote that turns the amps on/off. Are you jumping from amp to amp or using a relay?
 

AnthonyO

CarAudio.com Veteran
10+ year member
Oct 18, 2005
2,757
95
Minot, North Dakota, United States
How do you keep it from spiking. Get a more efficient amp. That amp is power hungry.
Borrow an amp from a friend and see if you have the same problem. If not, there you go
 

Jonnyswboy

CarAudio.com Regular
Jun 28, 2019
119
11
Where is your amp remote connected? Do you have a clip indicator? You should make one out of a tweeter and capacitor if you don't and test the amp.

Also what is the final impedance of your subs at the terminals?
 

Spazz131

CarAudio.com Recruit
Mar 10, 2021
41
3
Michigan
  • Thread Starter Thread Starter
  • #15
Where is your amp remote connected? Do you have a clip indicator? You should make one out of a tweeter and capacitor if you don't and test the amp.

Also what is the final impedance of your subs at the terminals?
No I don't have a clip indicator How do I make one?
My amp remote is right at my side.

I would check your remote that turns the amps on/off. Are you jumping from amp to amp or using a relay?
If a relay is a distributor block than yes
 

metalheadjoe

Registered User
10+ year member
Oct 21, 2007
513
271
ND
Sounds like a problem with your alternator.

Electronics can't cause their supply voltage to increase; I don't know how some people come up with such ridiculous info, yet they spout it confidently. Dunning-Kruger Effect at its finest.

Pull your alternator and bring it to an auto parts store to have it tested. It's usually free to have them test it.

So much stupid "advice" in this thread.

You don't need a relay for two amps' remote turn-on. A distribution block is not a relay, but don't worry about that because you don't need a relay. Someone did some tests and a relay's coil pulls as much as seven amps' remote current (if i remember correctly).

Your ac compressor is not an "electrical component". However, Ford cuts out the ac when you floor it to give you more power, so that is likely unrelated and completely normal.
 

Jonnyswboy

CarAudio.com Regular
Jun 28, 2019
119
11
No I don't have a clip indicator How do I make one?
My amp remote is right at my side.


If a relay is a distributor block than yes
Use a multimeter on your remote wire, and cause the amp to turn off. What does the voltage on the wire drop to?
 

Spazz131

CarAudio.com Recruit
Mar 10, 2021
41
3
Michigan
  • Thread Starter Thread Starter
  • #18
Sounds like a problem with your alternator.

Electronics can't cause their supply voltage to increase; I don't know how some people come up with such ridiculous info, yet they spout it confidently. Dunning-Kruger Effect at its finest.

Pull your alternator and bring it to an auto parts store to have it tested. It's usually free to have them test it.

So much stupid "advice" in this thread.

You don't need a relay for two amps' remote turn-on. A distribution block is not a relay, but don't worry about that because you don't need a relay. Someone did some tests and a relay's coil pulls as much as seven amps' remote current (if i remember correctly).

Your ac compressor is not an "electrical component". However, Ford cuts out the ac when you floor it to give you more power, so that is likely unrelated and completely normal.
Okay, I do have another alternator here that I can try, there was a mix up so I currently have 2 HO alternators
 

Spazz131

CarAudio.com Recruit
Mar 10, 2021
41
3
Michigan
  • Thread Starter Thread Starter
  • #19
Okay, new realization
It does it when the cars "resting" voltage is higher. Like 14.0 to 14.5 whereas yesterday it sat at 13.8 to 14.2 and it did it less
 

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