7'sfalife

Ok, The problem is that I decided to rewire my fuel pump and with little background in electronics I was abit scared of the results. However I did it! Well some what anyway, I did it according to 1300cc.com site. By the way its a really good and user freindly site, But somewhere along the rewire I must have done something wrong because when I thought I was done I went to reconnect my battery and all of a sudden the fuel pump comes on, this happened without the key in the ignition or the jumper wire in place! Any idea whats going on? What wires I might have crossed? I have looked over this countless time and everything looks to be wired up wright! I just need some imput on what to check,relay ,resistor?I have already searched this forum for hours trying to figure out what went wrong, came up empty handed every time! Any help would be greatly appreciated! Oh, the car is a 10th AE!

7'sfalife

Anyone?

Scott 89t2

they Relay that you bought and added in is probably wrong. that is what causes the pump to turn on and off

7'sfalife

Its a 30amp 4 prong Auto relay from Radio shack. However I sure I have a wire in the wrong spot. This is how I have it set up!
86=stock fuel pump pos
85=stock fuel pump ground
87=10gauge from battery
30/51=ground to E&A
This is according to the back of the resistor!Maybe this will help!

Scott 89t2

yours sound wrong.

if you have a box or something that says which each # is for post it up. I can't seem to find any sites online that say what it is.

edit:

I think you want

30 battery
87 to resistor relay
85 old pump pos
86 old pump neg

85 / 86 can be swaped around
30 / 87 could too I think

with your setup now the relay should have the pump on all the time. since it is. everything else is probably right

7'sfalife

Ok according to the box it says
86=on/off switch 12v
85=ground
87=12v in
30/51=12v out

Scott 89t2

ok so

86 stock wire pos (which turns (switches) the relay / on off when ever stock pump had power)
85 stock wire ground = ground
87 battery = 12v in
30 to resistor relay (12v out to fuel pump, passing though other relay first)

hopefully you can understand that now as well just being able to hook it up

7'sfalife

Ok so I had it wired good the first time which tells me I messed up somewere else! Its still doing the same thing so let me see if I can switch some wires around and get it wright! I appreciate you help scott, any other thoughts?

7'sfalife

Got a question, Should the two speaker wires coming from the front of the car both be seeing 12v? Mine are, maybe thats the problem!

7'sfalife

Anybody?

Scott 89t2

the "c" speaker wire will have 12v "when the pump is running". not sure about D it might.

however it should only be running with the key in and the jumper jumped. or car running.

the problem seems to be upstream more

so as soon as you connect the battery. the pump turns on? this is correct? with no key or jumper

check the stock pos wire running into the relay for 12v. it'll probably have it. but it shoudln't.

knowing that will help narrow it down though.

7'sfalife

Ok, The stock pos from the pump has nothing until the key is in and the jumper jumped! Then I get 12.9v so that seems to be ok!

Scott 89t2

hmm... well it's not the relay then. you must have the wiring at the resistor relay wrong and the speaker wire is giving it power.

edit: wait that doesn't make sense either since the speaker wire shoudln't have 12v untill the key is in either.

Scott 89t2

so you say both speaker wires have 12v with key off??

NZConvertible

This might help

7'sfalife

Ok I made a mistake, Only one of the speaker wires is seeing the 12v, does that help any?

Scott 89t2

hey that's pretty sweet I would recheck over all your colors at both ends with those 6 wires.
on the top as long as you have both blue/reds with blues it's ok. doesn't have to be the exact one with the exact one. since it's impossable to tell after cutting the plug away.

I think it's possible that "C" will always have power on an 87-88 car after some more looking. it won't on an 89-91.

Scott 89t2

yes I think that is right on the S4

now check the connections vrs color from above. you probably have one wrong.

7'sfalife

Ok I noticed that the relay on the chart is a 5 prong should I have gotten one of them instead? Also the 30 on mine is going to E&A and 87 is the battery wire,would this cause it to stay on like this!

Scott 89t2

you can reverse those 2. it's fine. you only need 4, hence why nothing is on the 5th. some are 5.

your relay is working because you don't have 12v comming out of it with the key off.

my best guess is your speaker wire is turning it on.

so check those 6 wires at the front and back and see if the colors are connected together right.

RunningDeer

[QUOTE]Originally posted by NZConvertible
[B]This might help

gheez Jason, I am impressed.. excellent piece of work

NZConvertible

Feel free to add the schematic to your website.
"C" should always have power with the ignition on (S4) or when running (S5). On S4's it's fed from the main relay and on the S5 it's fed from the circuit opening relay along with "A".

Relays are very simple devices that can be wired in various ways to get the same result. Terminals 85 and 86 are the magnetic coil, so it doesn't matter which way around they go. Terminals 30 and 87 are the actual switch, so it doesn't matter which way around they go.

The way I've shown just seems to be the convention. The input power goes to 30, and the output to the device being switched is connected to 87.

The fifth terminal in the middle is 87a, and some relays don't have it. With 5-pin relays the power goes from 30 to 87a with the coil off and from 30 to 87 with it on. You do not need a 5-pin relay for this mod.
The power of MS Paint!