sunshine

iTrader: (3)

I'm looking to beef up my grounds...starting with the engine ground. Is this the wire? (I just thought it would have been thicker!)

What gauge should I use to redo this one?

btw, the car is a S5 n/a.

rico05

I used a 14G, and that fried out, so I put in a 12G. Ran it for about 2 months w/ no problems.

sunshine

iTrader: (3)

Question #2:

Here is the back (bottom side) of the "pressure sensor".

which wire is the one that needs to re-grounded?
As you can see there are 5 wires, one green and two pairs of brown.

Can I re-ground the wire (whichever one it is) to the back of the mounting bracket of the pressure sensor which bolts to the strut tower?

What gauge wire should i use for this one?

Thanks in advance!

Sniper_X

NO its not.

Its one of the many.
the MAIN engine ground is located behind the oil filter on the tranny bell housing flange.

Its part of the harness that dives tward the starter.

rico05

That is where that wire connects to Sniper. It connects from the firewall to the bellhousing. Trust me, I have fried it twice...

seventhgear

so how many IN ALL graounds are there? where are most located? and where can i buy this 12g wire?

vaughnc

I'm looking to beef up my grounds...starting with the engine ground. Is this the wire? (I just thought it would have been thicker!)

What gauge should I use to redo this one?

btw, the car is a S5 n/a.



Question #2:

Here is the back (bottom side) of the "pressure sensor".

which wire is the one that needs to re-grounded?
As you can see there are 5 wires, one green and two pairs of brown.

Can I re-ground the wire (whichever one it is) to the back of the mounting bracket of the pressure sensor which bolts to the strut tower?

What gauge wire should i use for this one?

Thanks in advance!

seventhgear

when u ground whichever one of those wires on the pressure sensor where do u ground it to ? any where onj the body ? im really interested in knowing this

NZConvertible

Like Sniper said, it’s not the main ground, it’s one of several. There’s no need to remove that one, just add some more. I added three additional ground wires, all 8GA; one in the same place as the one you indicated (bellhousing to firewall), one from the back of the inlet manifold to the firewall and one from the battery negative post to one of the leading coil’s mounting bolts.

seventhgear

where do u find this wire ? homedepot?

rico05

I was told to do one from the negatin\ve battery terminal to the chassis, and one from the positive terminal to the nut on the alternator. Never got around to it though...

vmb

go to discount auto parts and but battery wire the fatter the better !
or a place that sells radio equipment ,electronics etc

seventhgear

how about for the smaller grounds such as the bell housing to the fire wall ground? what kind of wire for those? where would i buy that at ?

bcty

was was also going to tackle this soon too as soon as i can get some pics.. does anyone have any pics where they have the alt grounded? and where should the rest be?

HAILERS

On a 86-88, the brown/ black wire would be the ground for the boost/pressure sensor. I DO NOT have a electrical schematic for your year car. I'm fairly sure its the brown/black wire. Get a digital meter out and ohm the black/brown to the neg terminal on the battery. Should be less than one ohm. Prefer .0025.

Someone with a 92 manual help the guy out.

IF the black/brown reads less than one ohm, I would not add an extra ground there. Would seem adequate at less than a ohm. Key off when checking the resistance, please.

Rxmfn7

iTrader: (4)

Uhm...Maybe Im not thinking right but a wire from the + terminal to the alternator just doesnt sound like a good idea, wouldn't that be like running a wire from the + terminal to the - terminal?? Itd just fry. Maybe Im wrong though. Anyway, I ran an extra ground from one of the intake manifold bolts to the passenger side body. I dunno what thickness it was, it was the main engine ground off of my old Caddilac Eldorado, its as wide as two of my fingers.

NZConvertible

Yep, you're wrong! He was talking about running a wire from the alternator output post to the battery's positive post, to hopefully increase the charge rate. I've done this myself, but forgot to check voltages before and after. The lights don't seem to dim as much at idle though, so it's an improvement.

NZConvertible

Just run 8GA (or bigger) for everything. For grounds, bigger is better.

NZConvertible

You don't need pics, just follow the descriptions above, it's pretty simple. You're just looking for bolts on the engine and bolts on the chassis. Don't ground the alternator, it's already grounded by touching the block.

seventhgear

well are there any other new grounds to put on the 7 other than the ones that were told in this thread
jack

banzaitoyota

Make sure all your exhaust grounds are intact. I think there are 5

seventhgear

where might they be located?
can i find grounds for everything in the manual?

600HP CLUB

bump bump, might get 88rx-7 soon, thinking about adding grounds before i do crazy **** to it

downwinddave

Try Alcno marine wire from West Marine. Each strand is tinned. I ran 10 gage from block through fire wall gromet to ECU (91 NA) harness ground point (5 black wires in one plug) then to the bolt on the ECU bottom left.

silverrotor

iTrader: (1)

I've added an 8 gauge wire from the alternator to the + Battery and have noticed an Increase of 1.5 volts at Idle. This quick mod Is not stressing the Alternator as much.