Amp turns off... still

[metalheadjoe 10+ year member]

Wait, scratch that. Let us not roil this man's thread.

You've already foiled it with your ridiculous suggestions.

 

[AnthonyO 10+ year member]

I just googled 2008 Ford F-150 voltage spike. Holy sh@t, this is common as hell in the 2006-2008 F150. Some people have tried 3 to 4 alternators and get the same issue. Good luck. Hope you figure it out.

 

[Spazz131]

When I indused the issue and tested at the cig lighter, it showed 17.02

CHECK YOUR ALT PINS AND SEE IF THE ALTERNATOR WIRING HARNESS IS LOOSE WHEN IT'S PLUGGED INTO THE ALT.

I've had that happen before because my explorer had basically no exhaust and it vibrated the truck a lot, and it would vibrate my alt wiring harness out of the alternator enough that I lost voltage control and I would spike to like almost 18 volts

Okay, checked the pins and they seem to be tight, I certainly struggled to unplug it.

Buck just brought up a good point on another thread. Have you checked the subs' impedance?

I run then at 1ohm, but unfortunately I don't think it matters, but I will still check, maybe something else is wrong there haha.

Try the other alternator like Metalhead suggested

So, I finally got around to doing this, and the results were Interesting. First let me start by saying this alternator uses a different wiring harness than my stock and causes a charging code no matter how I wire it. I have verified everything (to my knowledge) is working. Upon testing I was able to induce the issue be it a lot less. I need more time to test as, i need to get voltages and, like I said sometimes it works well sometimes it does not.



I think I responded to everyone's ideas... all your feedback is great and truly appreciated. I'm sorry my truck is a lemon haha

 

[metalheadjoe 10+ year member]

Do you still have the oem alternator to try?

Bring your alternator in to get tested.

 

[Spazz131]

Do you still have the oem alternator to try?

Bring your alternator in to get tested.

The oem is broke unfortunately, ill look to testing. Do they need the alternator out to test?

 

[AnthonyO 10+ year member]

Quick question. Have you checked the battery cables to make sure they are secure and not corroded?

 

[Spazz131]

Quick question. Have you checked the battery cables to make sure they are secure and not corroded?

I actually replaced the terminals not to long ago. Do you think that could affect it?

 

[AnthonyO 10+ year member]

I actually replaced the terminals not to long ago. Do you think that could affect it?

As long as they are secure and not corroded. Since you just replaced them I would recheck your connections. Make sure everything is tight.

 

[Spazz131]

As long as they are secure and not corroded. Since you just replaced them I would recheck your connections. Make sure everything is tight.

I will. Mind you I have before but its worth it again.

I just had a capacitor delivered. I'll have to see if that helps at all as a bandaid to the issue.

As for the other alternator, it's definitely a lot more stable, but it's not really fixing the issue... plus idk about yall but I don't like having lights on my dash. I think im gonna swap in my stock voltage regulator, into the ho alternator and see if that makes a difference

 

[Buck 5,000+ posts]

Do you watch your voltage as you drive?

 

[Buck 5,000+ posts]

Check your FIELD wire

 

[Buck 5,000+ posts]

I will. Mind you I have before but its worth it again.

I just had a capacitor delivered. I'll have to see if that helps at all as a bandaid to the issue.

As for the other alternator, it's definitely a lot more stable, but it's not really fixing the issue... plus idk about yall but I don't like having lights on my dash. I think im gonna swap in my stock voltage regulator, into the ho alternator and see if that makes a difference

FIELD wire. My HO alt made my battery light come on as well. I never cared enough to figure it out. The car computer maybe doesn't like the way the alt acts.

 

[Spazz131]

Do you watch your voltage as you drive?

I do

FIELD wire. My HO alt made my battery light come on as well. I never cared enough to figure it out. The car computer maybe doesn't like the way the alt acts.

Is the field wire the one that rest around 7 to 12v?

 

[Buck 5,000+ posts]

I do


Is the field wire the one that rest around 7 to 12v?

The field wire IIRC determines the load your alternator thinks it has. So if that wire is messed up, it can mess with your charging voltage. This is from memory, but you may want to look into that.

 

[metalheadjoe 10+ year member]

I actually replaced the terminals not to long ago. Do you think that could affect it?

No. Corroded wires don't increase voltage. If they did, we'd all run corroded wires to our amps to keep our voltage up.