where are the gound points at in a 87 sport?

 

There are tonnes of them. Grounds are all over the car. Off the top of my head (and I may miss some):

-ground from battery to chassis under shock tower
-ground from starter to same point
-small ground on rear of intake to firewall
-ground to lower intake (behind water pump)
-multiple grounds along the exhaust system to chassis
-big ground cluster near main relay on driver shock tower
-several small grounds connecting to bolt under airbox
-condensor mounted to slave cylinder

As I recall, the FSM has a ground location diagram.

 

There are 26 dedicated ground points in the electrical system, plus many items that are grounded directly, and they're all shown in the FSM Wiring Diagrams.

If you want some useful info, you're going to have to give us a bit more to go on.

 

i need to find the ground that leads to connect to the negtive on the battery

 

lol... they all go to the neg of the battery. its what theyre for

 

It's bolted to the starter motor. Look at the pic on page 5-21 of the FSM Electrical System chapter. It's held uder bolt 'a'.

 

well if i knew i wouldnt be asking. hers the related post, thats why i asked that.
https://www.rx7club.com/2nd-generation-specific-1986-1992-17/car-wont-start-431491/

 

It sounds to me like the negative battery cable has a bad connection at the battery since YOU say the battery itself is good. Check the positive cable also. Pull both off and clean the cable attach points and the posts on the battery. Then try again. If it fails, and the lights ont he dash go from bright to dim, get out and touch the pos and neg terminals and feel for which is HOT. That is the bad cable attach point.

The negative battery cable goes from the battery neg post .......to an attach point just below the left hand strut tower......then to the long starter bolt. In some cases it MIGHT not go there but be attached to a transmission bolt just above the starter bolt. Secure both points I just mentioned, making sure the attach surfaces are grime free.

Maybe next time you try to start the car, and you just get a click.....turn on your headlights and try again. If the headlights do not dim when you hear the click from the starter, then I'd say you have a bad starter solenoid.

You do NOT have a bad starter solenoid if when you try to start you hear a click from the starter AND then the idiot lights go very, very dim. THAT scenario is a case of a battery cable not being attached to the battery post. It could be the positive as well as the negative cable OR both. It could also be a bad battery, but yours is good according to what I think I read.

 

Or, if your sure you have things attached right on the battery, get under the car with the car in neutral. Pull the tiny wire off the starter solenoid. It pulls straight off a blade. Now get a screwdriver and touch that small blade with part of the screwdriver and the large wire on the starter with another part of the screwdriver. The starter should turn over. Let us know what happen or what hospital you are writing from because you forgot to take the car out of gear first.