User Tag List

Reply
 
Thread Tools Rate Thread Display Modes
Old 07-22-2019, 01:22 PM #1
Mattew's Avatar
Mattew Mattew is offline
Member
 
Join Date: Dec 2017
Location: Prague
Posts: 39
Mattew is on a distinguished road
MY GARAGE
Mattew Mattew is offline
Member
Mattew's Avatar
 
Join Date: Dec 2017
Location: Prague
Posts: 39
Mattew is on a distinguished road
MY GARAGE
Weird electrical problem

Hey guys, I am looking for help and tips here. My truck is having some electrical issue for sometime and I am unable to fix it.

Behaviour of truck is this:

When I turn key from ACC to IGN it goes crazy with instrument cluster lights turn on and off very quickly (glow, filter, t-belt, charge, both turbo indicators - those are supposed to be on when at IGN but engine off) and I can hear glow plug relay click rapidly as well. In most cases clock power goes out (clock resets) and voltmeter jump betwen min to half way. Its like turning ign on and off very fast or disconnecting battery. This "clicking" stage last from half sec to 3-4 sec after that its:

a) dies completly. That means no power to anyting, no interior light, no radio, no clock, turning key to START do nothing. Hazard lights worked but flash rapidly like some bulb is out.

b) it recovers and stay on. Then its possible to start normaly and drive without problems.

From the death stage when turn key back to acc all goes back to normal aka clock turn back on, radio back on (reseted if death stage was too long), interion light are back on. When try to switch again to IGN, it repeats.
No idea what it could cause this. I suspecetd ground somewhere since last time when it did not want to stay on (at ign) I resolved issue by wiggling ground wires at battery?? But nothing helped in permanent way after I tried couple things.

What I tryed so far:
1) checked battery connections, especialy ground. All looks good.
2) added new ground to chasis wire parallel to old one (old did not looked okay)
3) added new ground to chasis - to drive side
4) cleaned battery terminals and chasis grounds - it helped for while. no idea how and why.
5) checked voltage drops for grounds at several points in engine bay. All measurments were less then 0.02V so basicly no voltage drop. Battery voltage 12.66V (when it sits for several hours)

During one of death stage I did measure voltage on battery and it was about 12.4V and rising, like when load is disconnected. Thus I suspect nothing is shorting out a power but somehow something disconnect it all. I plan try to disconnect pre-heating timer (I have little suspcion on it). Maybe try to do some measurments in ignition switch, mabye ign contact is failing. But that do not explay why wiggling wires in engine bay helps, even only temporary.

Anyone encounter similar issue? Or have any idea what is going on? At this point I ll be glad for any tips.

Thanks

PS: I did have video of that crazy clicking, but guess that not help
__________________
91' 4Runner / 2.4TD / 4WD
Mattew is offline   Reply With QuoteReply With Quote
Old 08-01-2019, 01:00 AM #2
Mattew's Avatar
Mattew Mattew is offline
Member
 
Join Date: Dec 2017
Location: Prague
Posts: 39
Mattew is on a distinguished road
MY GARAGE
Mattew Mattew is offline
Member
Mattew's Avatar
 
Join Date: Dec 2017
Location: Prague
Posts: 39
Mattew is on a distinguished road
MY GARAGE
Update:
I was able to narrow it down to glow plug system. When I disconnected pre-heater timer (aka glow plug controller) then suddenly everything is fine. Reconnecting it while key is in IGN position make truck die and disconnecting again fix everything. Also did tried to disconnect power side of main gp relay and it fixed problem, reconnected but problem did not come back. Two days it worked no problem. This morning it went bad again. Disconnecting relay did not fix it this time, disconnecting timer unit did. I even started without GPs. After I stopped car, I did tried switching back to IGN and all worked. In most cases it works when engine is hot, but few times did not.
Could be shorted glow plugs? But why no voltage drop on battery or blow fuse if there is short. And why it work one day and second day its completely FUBAR.
I am planning to wait until all goes bad again and then try to disconnect wire from GP bus bar. If that helps = something wrong with GPs, if not, well then its wiring somewhere.

Mattew
__________________
91' 4Runner / 2.4TD / 4WD
Mattew is offline   Reply With QuoteReply With Quote
Old 08-06-2019, 01:20 AM #3
Mattew's Avatar
Mattew Mattew is offline
Member
 
Join Date: Dec 2017
Location: Prague
Posts: 39
Mattew is on a distinguished road
MY GARAGE
Mattew Mattew is offline
Member
Mattew's Avatar
 
Join Date: Dec 2017
Location: Prague
Posts: 39
Mattew is on a distinguished road
MY GARAGE
Update no.2

During weekend I was able to do more testing and diagnosis on issue and now my conclusion is that glow plugs are not a problem, they only make main issue to appear. Main problem seems to be the main fusible link. That one from battery to fuse box. It seem to be weakened or half broken or something like that and thus I was uneble to test it. From what I read its best to take it out and test it outside of vehicle AND replace it while at it. But during my testing and after evening of thinking it all makes sence.

Lets start with simple thing like a clock, why that did went out and what that has to do with starting or glow plugs? Well, nothing since clock's memory is powered throug Dome fuse and there are no switches or relay. My measuring showed values between 0.7v-3v at dome fuse when truck 'died' but battery volatege sits at nice 12.6v. Only important thing between battery and dome fuse is fusiable link. This volatege drop could been observed on interior lights. They did not went out completly, bulbs were still glowing a little bit.
Why flasher went crazy when I did try to turn on hazard lights? Wrong volatege most likely due to voltage drop at fusible link.
Why all worked okay when engine was running? Alternator provided direct power and fusible link was used only to charge battery at that time.
And finaly, what glow plugs has to do with that all? Most likely GP's high current draw thourh weakened fusiable link crated big voltage drop there, cutting all power to truck. This voltage drop did make GP timer and relay to turn off, killing high current draw, removing voltage drop, that makes voltages go back to normal, that makes gp timer to kick back on, crates high curent draw, makes voltage drop, makes timer to turn off.... see? that is whole crazy relay clicking thing.

Now I did fix it by 'taping' on to fusiable link, since them its fine. What a fix That also explain why wiggling ground wires helped in past and why cleaning battery terminal helped -> actualy me working around fusible link and moving it around helped most likely.

I will be replacing fusible link. Sadly fusible link do not exist in this part of world somehow, so I will be replacing it with 80A MAXI fuse. Then I ll see if that fix it for good or not.
__________________
91' 4Runner / 2.4TD / 4WD
Mattew is offline   Reply With QuoteReply With Quote
Reply

Tags
back , battery , ground , ign , stage

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Weird electrical problem. Parasitic drain? jpeaslee 3rd gen T4Rs 6 02-16-2016 11:43 AM
Weird electrical problems .... duffbeer911 3rd gen T4Rs 2 03-03-2014 11:46 AM
Weird Electrical Problem Badbob Classic T4Rs 3 01-07-2013 08:09 PM
Weird Electrical problem johnnyd 3rd gen T4Rs 2 06-30-2012 05:33 PM
weird electrical problem gapboi210 3rd gen T4Rs 0 07-02-2007 12:09 AM

Powered by vBadvanced CMPS v3.2.2

All times are GMT -4. The time now is 04:37 AM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Feedback Buttons provided by Advanced Post Thanks / Like (Lite) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
User Alert System provided by Advanced User Tagging (Lite) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
***This site is an unofficial Toyota site, and is not officially endorsed, supported, authorized by or affiliated with Toyota. All company, product, or service names references in this web site are used for identification purposes only and may be trademarks of their respective owners. The Toyota name, marks, designs and logos, as well as Toyota model names, are registered trademarks of Toyota Motor Corporation***Ad Management plugin by RedTyger
 
Copyright © 2019


Garage Plus vBulletin Plugins by Drive Thru Online, Inc.