4A-GE MK1 Engine Electrical Issue,various components affected

chuyjmv · 06-19-2009, 07:44 PM

What's Up Everyone!
I have a problem with my 1987 mk1 4age that has been bugging me for quite some time now. It first started with my headlamps not working,& a loud buzzing noise coming from the lower left kick panel area.I finally traced it to bad circuitry at J/B 4 (or J/B 3!). I removed all grounds (earths) from said J/B,& made my own ground (earth).I now have headlights that turn on! I replaced the relay that was making all that loud buzzing noise for good measure.
Then my battery started draining! I found that the eng bay fan never turns off after removing key from ignition,& intermittently will not come on either (after driving & turning car off).I also noticed that the needle for the battery guage drops when using turn signals,dome light doesnt work when opening either door (manually does turn on),cluster & a/c lights flicker,then turn off.If I cycle the headlight switch,cluster lights come back on! I have already replaced the headlamp sw! I have tried finding a replacement J/B with no luck. Has anyone else run into this issue?? Any info would be greatly appreciated. I'm tired of having to disconnect the battery!

Jackstand Queen · 06-25-2009, 11:05 AM

The wiring harness of your car is interconnected in many, quirky ways. By creating new ground points for the junction boxes under the dash, you may have created short circuits in the wiring harness.

My advice is to clean up the original grounding points, add a little lithium grease to prevent future corrosion. All the weird problems might go away instantly. Its worth a try.

chuyjmv · 06-25-2009, 11:25 AM

Good lookin' out, Thanx!

chuyjmv · 06-06-2010, 04:40 AM

Quote:

Originally Posted by chuyjmv

Good lookin' out, Thanx!

Update! I found my problem with the eletrical,but forgot to update the post! I found all my electrical issues, previously noted, related to a blue junction box underneath the drivers side dash! It looks like a couple of the many connectors to the box got a little hot,& was causing my headlight issue,turn signal issue , cluster going blank at night issue,ect. There is a ribbon cable from the box ,splined into the main harness, which, i dont know why they didnt make a friggin' connector for?!?!??!

06-19-2009, 07:44 PM	#1 (permalink)
chuyjmv sum skills Join Date: May 2009 Location: San Jose, CA USA Posts: 21 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (2/100% )	Electrical Issue,various components affected What's Up Everyone! I have a problem with my 1987 mk1 4age that has been bugging me for quite some time now. It first started with my headlamps not working,& a loud buzzing noise coming from the lower left kick panel area.I finally traced it to bad circuitry at J/B 4 (or J/B 3!). I removed all grounds (earths) from said J/B,& made my own ground (earth).I now have headlights that turn on! I replaced the relay that was making all that loud buzzing noise for good measure. Then my battery started draining! I found that the eng bay fan never turns off after removing key from ignition,& intermittently will not come on either (after driving & turning car off).I also noticed that the needle for the battery guage drops when using turn signals,dome light doesnt work when opening either door (manually does turn on),cluster & a/c lights flicker,then turn off.If I cycle the headlight switch,cluster lights come back on! I have already replaced the headlamp sw! I have tried finding a replacement J/B with no luck. Has anyone else run into this issue?? Any info would be greatly appreciated. I'm tired of having to disconnect the battery!

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06-25-2009, 11:05 AM	#2 (permalink)
Jackstand Queen Cage Fighter Join Date: May 2008 Posts: 840 Thanks: 75 Thanked 64 Times in 60 Posts iTrader Rating: (1/100% )	The wiring harness of your car is interconnected in many, quirky ways. By creating new ground points for the junction boxes under the dash, you may have created short circuits in the wiring harness. My advice is to clean up the original grounding points, add a little lithium grease to prevent future corrosion. All the weird problems might go away instantly. Its worth a try.

06-25-2009, 11:25 AM	#3 (permalink)
chuyjmv sum skills Join Date: May 2009 Location: San Jose, CA USA Posts: 21 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (2/100% )	Good lookin' out, Thanx!