Electrical gremlins .... (1 Viewer)

[mcmlxxxv]

Since a few week my truck started to have some dash lights to flicker... or even stay on for some while ... (brake , battery and filter light).

All 3 come on at the same time and go away at the same time in random moments.

Just want a little advice on where to look at first... If someone have the electrical plan for a canadian BJ60 that be great too

Have a video of the problem ... but I cant post it probably too large file

 

[OSS]

Those things all join together in a common junky grounding buss located behind the instruments. Over time the common ground connector can lose its integrity - and electrical mayhem ensues. Check it

 

[mcmlxxxv]

Those things all join together in a common junky grounding buss located behind the instruments. Over time the common ground connector can lose its integrity - and electrical mayhem ensues. Check it

Thx !! Will look it up

 

[duncanrm]

Its likely that your alternator is about to leave the chat.

 

[mcmlxxxv]

Its likely that your alternator is about to leave the chat.

Voltage gauge is stable tho ... I do have a spare but ... I wish its only ground issue arsh pavement or bumpy road make it more likely to happen ... but yo are probaby right as its almost only when the engine is hot

 

[duncanrm]

Voltage gauge is stable tho ... I do have a spare but ... I wish its only ground issue arsh pavement or bumpy road make it more likely to happen ... but yo are probaby right as its almost only when the engine is hot

Is this a digital voltage gauge? The factory voltage gauge is pretty coarse, your battery will have a surface charge of 13V or more for a brief time after the alternator has shat the bed.. the flicker on the gauge from a charge voltage of maybe 13.9V wont really be noticeable. There's really not much prospect that its going to be much else, I'd be starting with the alternator personally - if you're handy new brushes can be installed as that's the most common fault. Alternatively, if you have an externally regulated alternator and original factory wiring maybe its time for an upgrade along with some love and attention to wiring.

Being a BJ60 you'll have the oil hoses on the vacuum pump at the back of the alternator - these are likely well past their use by date if they are still the factory originals and should be replaced even if you keep the alternator - and given your location I would hazard a guess you have a 24V vehicle, sourcing an alternator for this application MAY be problematic.



The earth referenced above wont cause lights to come on.. for reference, the image below shows the busbar that commons up a bunch of earths in an 8 pin plug.

 

[mcmlxxxv]

Yes 24v ... its the factory gauge yes . It dosent show weakness from the alternator from what I noticed .Even if the 3 lights stay on for a minute or so the needle is stable. But I might have a digital gauge wired to check on that just to make sure

Thx for all that valuable advice

 

[mcmlxxxv]

Didn't had time to test it but im pretty sure the brushes are now too short as I completly lost it ,the lights are now on all the time . Will change the alternator tonignt and look this one up for answers

 

[mcmlxxxv]

Well ...

Brushes are like new ... inspected connectors and wiring everything is nice cleaned battery posts and reinstalled everything. Seem ok for now .....

Alternator belt is worn out tho .. and its not even 5k km old it might slip ?

 

[mcmlxxxv]

Changed the belt... did not fix the problem so I inspected the wiring ... witch lead me to a relay on the driver side , Charging light relay and it turns out it was the culprit.

Seem like a rare / discontinued / expensive / pain in the ... part to find ... so I will try to fix it this week.


Thx for all your guidance

 

[RevISK]

Glad you were able to find the issue.
Other than suggesting “check your grounds” I wouldn’t know what to contribute.

 

[mcmlxxxv]

Glad you were able to find the issue.
Other than suggesting “check your grounds” I wouldn’t know what to contribute.

I checked them too

 

[mcmlxxxv]

Well ... in the end , replacement relay are discontinued ... and used ones are much too expensive for what they are ...

So .. I got myself a 24v 5pins relay and wired it up in a way to make it work.

Fixed it for 20$ of all new components ... IMO , better than any used OEM relay.

Easy to do too .. will post the pinout I did on it tomorrow .

 

[mcmlxxxv]

So there you go : according to this page in the manual the pinout is as followed

You just wire it like you would install a 4 pin relay but you jump 30 and 86 together