Honda-SOHC

SOHC.co.uk Forums => CB500/550 => Topic started by: SteveW on October 30, 2017, 08:41:43 PM

Title: Green earth wire issues
Post by: SteveW on October 30, 2017, 08:41:43 PM

My wiring is a nightmare, especially the green earth wire which looks as like some heavy current has gone down it at some stage.

The green wire is earthed to the frame just by the coils. Is it earthed to the frame anywhere else?

Thanks.

Title: Re: Green earth wire issues
Post by: petermigreen on October 30, 2017, 08:55:16 PM

Battery negative lead to RHS upper rear engine mount bolt on 500, possibly 550 too.
Peter

Title: Re: Green earth wire issues
Post by: SteveW on October 30, 2017, 08:58:54 PM

Yes, that one is in place.

One of the few cables that look in reasonable condition.   :(

Title: Re: Green earth wire issues
Post by: mike the bike on October 30, 2017, 09:33:09 PM

Without the heavy duty earth cable connecting the battery to the frame, the return current will use the thinner earth leads and over heat them, that why the thick earth strap is so important.

Title: Re: Green earth wire issues
Post by: SteveW on October 30, 2017, 09:38:15 PM

I'm guessing thats whats happened at some point in this bikes life, the green wire is fried.

Title: Re: Green earth wire issues
Post by: BigAl (Alan) on October 31, 2017, 10:07:30 AM

Over heating of the green wire within the harness is a common issue with many of the old Honda's (see image) The old PVC insulation had quite a low temperature rating. Thin-wall insulated cable (higher temperature rating) provides a better solution

Title: Re: Green earth wire issues
Post by: SteveW on October 31, 2017, 11:01:04 AM

Thats pretty much what mine looks like, the bit i can see anyway.

I'll replace the entire green cable.