Bad ground symptoms?

[aloshan]

Hi guys

OK so Ive posted something similar before but still no resolution. Was going to attempt to let the autoelec take care of this in between the r154 conversion but thats a bit delayed so thought Id tackle this on my own so I can at least start my car without the help of another. too scared to even run the brand new engine in as it needs a tune so it stalls in first gear and I cant get it started again due to this problem.

I can only ever start my car if its boosted by another running car.

Symptoms : When I turn the key it clicks (not fast rapid clicking like a bad battery connection , just clicking )

I replaced the starter with a freshly rebuilt one.

I have tried the 30A relay mod, didn't seem to make much of a difference

Left the car overnight connected to the battery:

Reading when i turned the car off :11.7 V

Reading the next morning : 7.7 volts.

It seems as if I have something draining my battery .

In saying that, after I starter the car with the help of another car , and drove around for half an hour , and then switch it off and immediately try to start again all I hear is the click. Shouldn't the alternator have charged the battery enough to at least start the car immediately after it was shut off.

Before I take my car to the autoelec I was wondering if these are symptoms of having a bad ground?

Theres a thick black wire connected to the inside of the engine bay with the other end connected to nothing. Would anyone know what this black wire is supposed to be connected to. Ground maybe?

Lastly, does anyone have an overall diagram of all the parts of the 7mgte and the electrical connections.

Yes I have the TSRM , just looking for something a bit clearer and a bit more detailed - what each part is etc, where each wire should go etc.

Any help appreciated, thanks in advance guys

 

[ATL88Supra]

is the battery new ? or old, also are the battery connectors new or old, sounds like a deadcell on the battery also might be a bad connection or just old wires

 

[aloshan]

is the battery new ? or old, also are the battery connectors new or old, sounds like a deadcell on the battery also might be a bad connection or just old wires

battery is fairly new, dont think thats it as it will hold its charge and only drop 0.1 V overnight if disconnected from the car (otherwise it drops by 4 whole volts!)

I have already cleaned the terminals etc...

Might be the old wires (this car was made in 1986 after all...)

what are the symptoms of a bad ground though?

 

[NashMan]

well you answered your own question in your post


that thick black wire is the battery ground to the block since the starter uses the block as a ground


second way of testing your starting system is to perform a voltage drop test http://en.wikipedia.org/wiki/Voltage_drop

here is a link i grabbed out of random http://diychamber.com/2010/03/voltage-drop-test-guide-for-toyota-starting-systems/

now as for your parasitic draw is most cause by stuck relay's or after market relay has bean added to the system stereo and alarms systems ect


http://flashoffroad.com/electrical/Batteries/BatteryDrain.html





good luck hope this helps you

 

[aloshan]

well you answered your own question in your post


that thick black wire is the battery ground to the block since the starter uses the block as a ground


second way of testing your starting system is to perform a voltage drop test http://en.wikipedia.org/wiki/Voltage_drop

here is a link i grabbed out of random http://diychamber.com/2010/03/voltage-drop-test-guide-for-toyota-starting-systems/

now as for your parasitic draw is most cause by stuck relay's or after market relay has bean added to the system stereo and alarms systems ect


http://flashoffroad.com/electrical/Batteries/BatteryDrain.html





good luck hope this helps you

thanks man , will look into these right now.

 

[hvyman]

Check the small wire on the positive terminal. It can look connected but really not be.

 

[NashMan]

Check the small wire on the positive terminal. It can look connected but really not be.

that wire will not cause this issue he is having that wire is the trigger wire for the solenoid

 

[mkiiichip]

Why did you start a new thread for the same issue? You never answered any of the questions there, and still have a bad battery, with major parasitic draw. Nothing has changed.

 

[mkiiichip]

Sorry for the annoyed post, but it gets old repeating myself.

Until you find a way to find the parasitic draw, this issue will not be resolved. I tried to explain it in the other thread.

A parasitic draw can be very difficult to track down. And checking the starting system is pointless at this point.

The parasitic draw is the reason your "fairly new" battery has screwed the pooch. Although you need a new battery, that is pointless until the "draw" is tracked down.

I can not explain "parasitic draw" any better than a simple google search. You have a lot of work ahead of you. But this IS your issue, No simple answers here on the web.

 

[jetjock]

Annoying, isn't it? Much better to choose more carefully and avoid the aggravation...

 

[aloshan]

Sorry for the annoyed post, but it gets old repeating myself.

Until you find a way to find the parasitic draw, this issue will not be resolved. I tried to explain it in the other thread.

A parasitic draw can be very difficult to track down. And checking the starting system is pointless at this point.

The parasitic draw is the reason your "fairly new" battery has screwed the pooch. Although you need a new battery, that is pointless until the "draw" is tracked down.

I can not explain "parasitic draw" any better than a simple google search. You have a lot of work ahead of you. But this IS your issue, No simple answers here on the web.

thats ok man thanks for taking the time to explain the problem. In between work , rain and just plain inconvenience, I haven't been able to get the tools or the time required to gain the knowledge to solve the problem and not ask repetitive questions.

I have a larger number of resources and responses to now attempt to fix this myself , otherwise its straight to the auto electrician

 

[aloshan]

seems to be a bad ground + massive parastic drain from somewhere( i can literally see the volts drop by 0.1 on my multimeter with the car switched completely off). Im just going to send it to the auto elec and get the wiring done brand new from the ground up.at least that way I have peace of mind. oh btw , this is the black wire that isnt connected to anything I was talking about :

 

[NashMan]

battery to chassis ground

 

[aloshan]

Annoying, isn't it? Much better to choose more carefully and avoid the aggravation...

exactly

still unable to locate the draw , but purchased a new battery ( that is disconnected ) anyway. Same problem have to fix my parasitic drain

 

[jetjock]

Zoom!

 

[aloshan]

Zoom!

um..ok?