My new amp (NVX MVPA4) states the ground should be no longer than 30". It's a lot farther to my neg. battery terminal than that.

My DD4 amp didn't have a spec for grounding max. length.

Where else have you guys put your ground to?
I could tap into the ground being used in the other amp.

 

Have grounded all my amps at the ground post next to the battery or the battery post itself, to include the NVX.

T

 

It's a fairly general consensus that running the ground back to the battery terminal (or ground post the battery is connected to) is the best practice. Even the BT4180 only comes with a short ground wire, but I believe most (including myself) have it ran back to the battery area.

 

Hey Sarge,
Not to hijack but when you get that NVX hooked up and jamming world you let me know if it has degraded your FM reception at all? Tailwind, maybe you have some insight here too. That's fellas!

 

I've put 3 in a fairing for others and no issue with fm reception.
I personally had one in my fairing with another amp and again no issues. I've since taken the NVX out to replace with another amp for a completely different setup.
It's a great little amp and sounded awesome with a set of focals

 

Thanks Tes, they're gonna run my 6x9's. I appreciate the insight. Again to the OP sorry to hijack.
-FW

 

Pretty much any bike I do is grounded to the negative post of the battery. Many folks have has success with grounding at the main ground post by the battery or at the triple tree.
I've never done that ONLY because I've never had a single issue with grounding to the battery.
The reason most manufacturers recommend 30" or less is to minimize a possible signal noise issue (whine). If your running the amp wireing from the fairing, use a good quality wire, of the proper size, and I'd hook to the battery.

 

The 30" or short as possible is intended for a motor vehicle with a chassis ground. A motorcycle has no real chassis ground, hence to battery or ground on trans case the battery is grounded to.

 

I'm running 8 awg for power and ground. Shouldn't have any grounding issues.

Since mine is a '16, I shouldn't have any fm reception issues.

 

Based on the suggestions by several of the gurus here, this is exactly what I did to wire my BT4180, ran the ground back to the battery. I have not noticed any issues at all.