My lights dim & horn beeped when we hit a bump ????

Submitted: Tuesday, Jul 12, 2011 at 22:31
ThreadID: 87528 Views:2684 Replies:6 FollowUps:5
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Ok all the wise ones out there ...... i have a 75 series 1HZ 1996 cruiser ....
I am really hoping it has happened to someone else, we went for a day trip out to Old Doomadgee Image Could Not Be Found and it was dark coming home, all was normal until the last 10 klms and every now and then the lights would flicker over corrugations, i just hoped it was a bulb in the spotties but it got worse and we both noticed the horn was also beeping at the same time, it got even worse, only on corrugations so we stopped and lifted the bonnet, wriggled wires, checked battery terminals, wriggled the wires running up the steering coloum b ut could not get it to do it whilst parked with the lights on, we headed off and it did not do it again .........
I will be honest, i am really afraid of electricial shorts and any wiring i have done is fused at both ends, very well insulated and secured well ...
So PLEASE someone tell me it is common and exactly where i can find the problem ????? we are planning our hols and dont need this .... :-(
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Reply By: Member - Joe n Mel n kids (FNQ - Tuesday, Jul 12, 2011 at 22:34

Tuesday, Jul 12, 2011 at 22:34
OooooKKKKK .... so thats what happens when you hit the "submit" button instead of the "preview" ....
Sorry guys, i was trying to slip the pics in of our trip at the end of the post ....
Hope you can all work out my question
AnswerID: 459784

Reply By: tom 2 - Tuesday, Jul 12, 2011 at 22:44

Tuesday, Jul 12, 2011 at 22:44
Gday joe sounds like a faulty combination switch or bad earth to me but im not a sparky nice fish though Cheers tom
AnswerID: 459787

Follow Up By: Mark&Sue - Wednesday, Jul 13, 2011 at 07:25

Wednesday, Jul 13, 2011 at 07:25
Hi Joe totally agree with tom , combo switch has headlights, horn & also wipers wired into this switch and the contacts are probably worn and full of dust. Cheers Mark.
FollowupID: 733416

Follow Up By: Jeff D - Thursday, Jul 14, 2011 at 08:23

Thursday, Jul 14, 2011 at 08:23
I definitely agree with Tom & Mark - I get the same problem with my '97 Troopy every now and again, I lose high beam through a build up of dust and muck in the combination switch. A good blow out with compressed air fixes it.


FollowupID: 733504

Reply By: Muntoo - Tuesday, Jul 12, 2011 at 22:46

Tuesday, Jul 12, 2011 at 22:46
Strange mate.

Been a while since i had my 75 series, so bit rusty on the wiring setup.

Did it flicker on high and low beam?

Best bet would be to look at a wiring schematic and suss out if those two circuits are in any way linked somewhere or share a connector, relay etc. Maybe they share an earth point or fusible link. Maybe even a connector under the steering wheel.

Thats where i would start. If nothing else was affected then it must be something that they share. Very hard to find though when its intermittent. But having the schematic and studying it will give you a good idea of what to check and how things are wired, also be handy in the future if it happens again.
AnswerID: 459788

Follow Up By: Member - Joe n Mel n kids (FNQ - Tuesday, Jul 12, 2011 at 22:56

Tuesday, Jul 12, 2011 at 22:56
yeh it worries me, if just the lights i could handle it but the horn at the same time ???? really strange to me .... yes when it is intermittent it makes it almost impossible ehh..
Cheers n thanks
FollowupID: 733404

Reply By: Member - Robbo (QLD) - Tuesday, Jul 12, 2011 at 23:05

Tuesday, Jul 12, 2011 at 23:05
Problem is Joe you should be in the EA Falcon!!
AnswerID: 459791

Follow Up By: Doomadgee Roadhouse - Wednesday, Jul 13, 2011 at 18:25

Wednesday, Jul 13, 2011 at 18:25
starting to think you may be right ....... you have a good memory hahaha
Actually it is so funny you say that, guess what we saw way out at Old Doomadgee, some old commodors, it is not the best of tracks out there eh but they made it ...

FollowupID: 733470

Reply By: Member - Joe F (WA) - Tuesday, Jul 12, 2011 at 23:52

Tuesday, Jul 12, 2011 at 23:52
G'day Joe

The 75 Series Cruisers are a tad light in the wiring department so if by chance you have extra lighting "spot" lights and possibly higher wattage Hi ~ Lo ~ H4 headlight inserts, it can cause your vehicles symptoms.

Firstly check the vehicles body earth cable as well as the battery negative cable. Over time (years) corrosion build up destroys the earth path, the corrugations simply might have highlighted it all.

Also replace the Positive battery lead ~ fusible link as these also deteriorate with time/corrosion. Check the wiring harness closely right back to the Solenoid on the starter motor, Toyota 75 Series are under wired in this department too.

Nice fish ;0)

Safe travells : PICTOURS
AnswerID: 459794

Follow Up By: Member - Bucky - Wednesday, Jul 13, 2011 at 05:16

Wednesday, Jul 13, 2011 at 05:16
Had a VF valiant, many years ago.

Strange things happened to it when the second earth strap was accidently left off..

Put indicators on at night, and the headlights would dim, and flash.
Horn would beep intermittently, ect ect ect..all instruments, except speedo would flick back and forward.

Suggest that you run a second Earth strap, this time, directly to the motor.

That trick also worked on my 2003 Navara, when she refused to start, even with the second battery, and heave duty jumper leads.

A short term fix might well be to find where the earth from the battery connects, (in the Nissan's case, it's to a painted inner guard) remove it, and scratch the "living buggery" out of the bolt hole, and the surrounding paintwork, to give the connection a good earth

FollowupID: 733409

Reply By: Member - Boo Boo (NSW) - Wednesday, Jul 13, 2011 at 16:12

Wednesday, Jul 13, 2011 at 16:12

I had a similar problem about 18 months ago in my 75 series troopy.

It was the fusable link next to the batteryit got old and corroded.

The lights dimmed and got worse when the indicator was on.

I turned the troopy off one day and 5 minutes later it wouldn't turn on. The link hadfallen apart with age.
AnswerID: 459843

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