
Originally Posted by
Eevo
i may have fried the ecu and engine loom.
not only did the smoke get out, there were flames too

Originally Posted by
Eevo
so ive got my main battery and 2 aux batteries separated by an isolation switch
something had been bringing down the batteries voltagewise, so i wanted to isolated the batteries to see if it was one battery that had gone bad and was pulling the other down.
i rang the manufacturer, explained my problem and agreed on my course of action. to deactivate the switch and isolate the batteries, all thats required is to remove the earth/ground wire from it.
the bolt for the earth is underneath the unit, so i picked up the unit a few cm's. something sparked, i dropped the unit, something sparked again, the elec fans turned on and the smoke came out. i went to go get a spanner to disconnect the negative from the battery as i came back, there was more smoke and flames coming from the engine loom. the wiring was live and melting/shorting in front of me.
my firefighter training kicked in and i poured water on the electrical fire. with the flames out, i disconnected the negative from both the main battery and the aux battery.
im guessing the isolator shorted or an unwanted feed though somewhere. i really cant understand how this happened.

Originally Posted by
Eevo
so i've had a bit more of a look.
cant find any shorts or anything out of place.
cant find any blown fuses either
so at least that tells me which side of the fuse the short was
i noticed that elec fan can on during the event. these should only come on if the ignition is on. didnt notice any other ignition items on, so i think the short is in the fan circuit.
recovery plan.
remove isolator, go to single battery system for now. remove loom and ecu, rewiring fans, rewire a few other things. hard to tell what is what sometimes.
get engine running again
reintroduce isolator and second battery system.
an update.
found some flash marks on the side of the ecu
on the side of the isolator, there are 2 metal bolts which you hook up the battery to. These bolts are live.
i must of let one of the bolts touch the metal case of the ecu when i picked the isolator up.
they are only a cm's apart
doing that created a circuit on the earth. ecu earth cable only rated for small current, so it melted. there are no fuses on earthing.
i had a chat to tim from traxide. the isolator is supplied with a cover for the bolts.
so the person who did he install didnt put the cover over the live bolts. very disappointing that something so simple wasn't done.
Current Cars:
2013 E3 Maloo, 350kw
2008 RRS, TDV8
1995 VS Clubsport
Previous Cars:
2008 ML63, V8
2002 VY SS Ute, 300kw
2002 Disco 2, LS1 conversion
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