1999 fireblade earth from main loom: location?

[Matt Strange]

Does anyone know where the green earth wire from the main loom terminates?. It doesn't go back to the battery directly, there is only the thick black wire to the engine casing.

Ta!

[Stu]

Nope but a wiring diagram would probably help

[Matt Strange]

I have both the official Honda workshop manual & the Haynes version, neither specify where the loom ground point is!

Hoping that megawatt chap might know?

I suppose I can ask at Harpers of Cowley on my way home tomorrow...

[Stu]

99% of the time you don't have a ground direct to the frame its via the battery or on a multi plug to the main earth wire that runs from the battery

[Matt Strange]

Well you see... I've taken the main battery earth lead off to clean it when I first got the bike, there was definitely nothing else attached to it and it runs directly from the - terminal to the engine block by the starter motor.

The loom has to have a separate ground point somewhere, every circuit on the bike has a green coloured ground wire and they all appear to be be connected together via soldiered joints (afaik).

[Stu]

Could possibly be through your starter solenoid?

Without seeing it or a wiring diagram I am just guessing

Megawatt will know for sure seen as though he owns one

[Matt Strange]

Here's a pic, main battery negative lead is no:7 on the drawing.

 

 

If there was a separate loom ground wire that ran back to the battery, surely it would have to be connected either at the same 2 points as the main earth lead i.e at either end, or directly to the wire itself in the form of a splice?.

Edited August 31, 2014 by Matt Strange

[Matt Strange]

Could possibly be through your starter solenoid?

Without seeing it or a wiring diagram I am just guessing

Megawatt will know for sure seen as though he owns one

 

Ta for the suggestion but I can't see how it can be, the solenoid isn't connected to the frame (a rubber mount to the plastic under tray, item 9 in the above drawing) and it only has positive connections apart from the earth from the reg/rec which disappears back into the loom - where it goes, ??!!

[Stu]

It could be internal to the earth connection on the solenoid so you won't see it but I am just guessing

Yeah the usually are spliced in the the main earth wire at the battery end

[Matt Strange]

It could be internal to the earth connection on the solenoid so you won't see it but I am just guessing

 

The solenoid is insulated via its rubber housing and it's mounted to the plastic under tray anyway, so it isn't earthed through the solenoid body. The earth wire just disappears back into the loom......

[Stu]

no what I mean is the earth may run in to the solenoid from the main look via the 4 thin wires from the loom and internally be connected to the main earth connection which you wont see

if you get what I mean

[megawatt]

It,s near the radiator top bolt on the left hand side of the steering head. Good idea to add an extra earth direct from the battery to the reg/rec wiring socket. Saves on replacement reg/recs.

[Stu]

easy as that

[Matt Strange]

Ta!

I've already used another route for the reg/rec earth, otherwise it didn't want to output more than 12.8v @ 5,000RPM.

[Matt Strange]

I bent down next to the left (fuel tap) side and had a quick look around the top of the rad, behind the horn mount etc, before things got dark - I couldn't see it.

Do I have to take any fairings off to gain access to it?

[megawatt]

Probably.

[Matt Strange]

I'm just being lazy, I've had the bike in bits along with the car, sick to death of vehicles right now. The less I have to do to check this earth the better!