got edis4 running sweet, now?

jpindy3 · Post by **jpindy3** » Sat Jun 20, 2009 9:14 pm

all good,now before i conect the mj, i wanted to ask,
is it ok to earth the mj and edis4 to the neg on the battery, i know this may sound silly

thanks

NITROPIXIE · Post by **NITROPIXIE** » Sat Jun 20, 2009 10:20 pm

In my experience its generally best not to as noise can introduce itself into the circuit. As it says in the installation instruction be sure to earth both the EDIS and MJLJ to the same points on the chasis.

Its always the trivial little things i find to get the system fully working. I had the wires crossed going to the coil pack from the EDIS and i think the Vr sensor wires were crossed too. Got there in the end though, good to hear you did

Yvan · Post by **Yvan** » Mon Jun 22, 2009 6:10 am

In my experience its generally best not to as noise can introduce itself into the circuit.

Are you sure that there is a difference in earthing to the chassis or to the battery terminal? What noise? And why is it not able to (properly connected to the battery) chassis?

NITROPIXIE · Post by **NITROPIXIE** » Mon Jun 22, 2009 6:46 am

I honestly don't know the ins and out of it, but when i was into having a massive stereo in one of my cars i got less noise when the amplifier was earthed to the chasis than directly to the battery.

I'm sure it would be the same for most things electronic. There certainly isn't anything to gan byputting it directly to the battery as in the end of the day the alternator will probably be powering it more than the battery would.

Dean924s · Post by **Dean924s** » Sun Jul 05, 2009 3:58 pm

NITROPIXIE wrote:There certainly isn't anything to Gan by putting it directly to the battery as in the end of the day the alternator will probably be powering it more than the battery would.

Not so. If you have a bad ground lead from the battery you will have issues (ask me how I know) Grounding directly to the battery is fine. They key is to have all round connections clean (wire brush and dielectric grease) I have on some cars I have build made ground terminal blocks that were both grounded to the chase (through the mounting bolts) and back to the battery via a cable. I use to put three of these in cars one in the cockpit one at the rear and one at or near the rad support. I would then run a custom made ground cable that had leads mounted to the starter bolt, the alternator bolt and the head and the frame In some cases I would run an additional ground strap to the frame from the motor as well.

I know all this sounds redundant but over the years the primary killer of electric components is resistance in the ground circuits. Alternators are usually the first thing to be killed but things like bulbs, computers / ECU's can all suffer. Many alternators actually measure the resistance to ground. Thus will overcharge and burn out if you have a poorly grounded battery / electrical system.