Electrical tantrum

[B20B24]

I wonder if anyone can suggest the cause of a severe electrical tantrum on my son's Evo 2 (1994).

It was running fine today when suddenly the electrics went mad  - an erratic (high) tick over, engine racing, all gauge needles jumping everywhere, battery gauge dead (the battery is fine) and indicators which seem to have a mind of their own.

We suspect a sensor, but could one sensor impact all this at once?

Thanks

Clive

 

[chugga boom]

common fault on evo electrics that my old car became a culprit to was the battery earth where it connects to the gearbox had almost corroded through but where the cable was crimped into the connector, to look at it looked fine when removed and inspected it was trashed and needed replacing, all my electrics went nuts and I had the problem for a few weeks until when starting the car it set the Goodrich hoses on fire as the starter earthed through them!!! worth a look but ive heard of a few with the same fault, as a tempory cure or to test just put a single jump lead from the battery negative to a good earth point on the engine

[B20B24]

Thanks Chugga, we'll check this out.

[fay66]

I'm right behind James on this one, as Dedra Technical Adviser I've come across similar problems with what appear to totally unconnected faults being down the the battery earth cable, on a number of Dedras including one of my own.

Brian
8227

[B20B24]

Well....I removed and refreshed the main earth to no avail.

We started looking at other earths and noticed the immobiliser was loose and unsecured sitting on top of the ECU, which in turn was unsecured. The ECU earth was loose, caused by the errant alarm unit. Anyway we quickly fixed that and hey presto all now working fine. The workmanship here looks shoddy (receipt in the history file from Toad, so a professional installation some time ago paid by the previous owner). The wiring looks amateur and if it were my car I'd rip the pesky thing out and chuck it, but I guess you'd be best paying Toad to remove it all as god only knows how it's all connected.

Thanks again to Chugga and Brian

Clive

[m tulloch]

I've found exactly that problem with alarm/immobiliser installations in the past on a few cars.

That's why I always fit them myself so I know it's done properly with solder & heatshrink.