putting relay on ground wire w/ ign trig

Hi all, is it possible to put a relay on a ground wire with a positive ignition cable? I already have my power inverter wired, and will have to tear the dash off to add the relay in on the positive line. Completely forgot about the relay until I buttoned up the install.

If you don't get what I am saying I will try to explain it better. I'm just busy with graduation and what not, been busy.

Thanks for your help!

-Travis

I would say you should run the relay off the positive side of the connection. The reason for the relay would be to take the current demand off the ignition wire by using it only to trigger the relay. Run a 12v+ to the relay pin 30 and 87 to the inverter. Pin 85 to ground and pin 86 to ignition.

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The wire I'm test'n isn't doin' what it's supposed to be doin'... I am so glad I printed that tech sheet, with the wrong info.
Do it right the first time... or I might have to fix it for ya

I was looking to avoid cutting the 8gauge wire as it's already run since I forgot to use the relay when I installed it (was in a rush to get to work). Now, in order to get to it, I have to remove my dash again. Easy answer is nope, no better ways, right? I shouldn't have the ground that long any way. I guess I'll just suck it up and tear it all apart again. I already left the sucker on over night. Luckily it doesn't pull enough current or I'd be stuck in Wildwood.

Since you have an 8 Ga. wire, I am sure you have it going to your battery.  Why not put the relay at the battery?  If of course the dash panel really is that hard to get off.

As long as the power wire is big enough and fused properly, and the ground wire is big enough and fused properly, I don't see an issue with putting a relay on the ground wire vs. the power wire.  (I think that is what you are saying).

You shouldn't have to worry about a long ground either, put the relay near the inverter, keeping the ground wire as short as possible.  Then, run your coil wires (small guage, low current) to the control source.

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Kevin Pierson

KPierson wrote:

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As long as the power wire is big enough and fused properly, and the ground wire is big enough and fused properly, I don't see an issue with putting a relay on the ground wire vs. the power wire. (I think that is what you are saying).

You shouldn't have to worry about a long ground either, put the relay near the inverter, keeping the ground wire as short as possible. Then, run your coil wires (small guage, low current) to the control source.

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Thanks for your suggestion, this is what I will do. Way easier in my opinion. Thanks again!

How do you recomend he properly fuse his ground wire?

maybe an early morning mistake. it was 9:30 when he posted :) but i would wonder how you fuse a ground wire

I'm not sure what I was trying to pull of there.  Fusing the ground wire wouldn't be ncesarry - not sure why I typed that in.  The ground wire does have to be big enough though!  Sorry!

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Kevin Pierson