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Under Tank Wiring Loom

 
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grant93
Flying Brick Rider


Joined: 23 Mar 2013
Posts: 238
Location: Victoria - Australia

PostPosted: Sat May 09, 2015 11:07 pm    Post subject: Under Tank Wiring Loom Reply with quote

Gidday Folks,

Yesterday I removed the radiator and electric fan and replaced the fan with a good used one, which came with a bonus spare radiator (ebay $52.00 for both) after the old one had seized, well tightened and would not spin to freely.

Anyways I put it all back together which is a straight forward job as a few weeks before I had it all out and installed all new coolant hoses but forgot to check the fan, silly me.

I went to start the bike and it would only turn over and not start the engine, this being odd and has never happened before in the 3 years I have own it, so off came the tank again and I search the wiring in case I had bumped something during the fan install.
Again I went to start and the same happened, no firing of the engine and this time I noticed that the fuel pump did not do its normal buzzing prior to starting.
The wiring loom under the tank seems a little touchy and once I moved it a little the fuel gauge left from left to right and the fuel pump fired up and the motor started.

This looms seems to be failing or on its way out, what are they called or listed under so I can buy a new one? or could it be something else and is this a common thing?

Any help would be great.
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1994 K1100RS
1981 R100RS
1978 R100RS
1928 Chevrolet tourer

www.montythe1928chevrolet.blogspot.com.au
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Jim
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Joined: 17 May 2003
Posts: 3840
Location: WHERETHEFUNNEVERENDS

PostPosted: Sun May 10, 2015 1:50 am    Post subject: Reply with quote

Grant,

clean the connectors and make sure they are plugged in tightly. All those wires end up in a rather large harness (I think) which is not cheap. If the problem is at the connectors, those can be changed. If the problem is in one of the wires, cut the bad section out and splice in a new section.

For some reason, the connectors on our bikes don't seem to hold up well. Use contact cleaner/enhancer like Corrosion-X or deoxit.
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Jim
1997 K1100LTSE 94,000 - has gremlins!
1995 R100RT Classic 16,650 crashed - repairing
1992 K75RTP 46,000
1992 R100R 24,000 - FOR SALE

"We shall not all die, but we shall all be changed."
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grant93
Flying Brick Rider


Joined: 23 Mar 2013
Posts: 238
Location: Victoria - Australia

PostPosted: Sun May 10, 2015 2:53 am    Post subject: Reply with quote

Gidday Jim

Many thanks for that, yes i have both of those cleaning products and will give them a go.. cheers
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Cheers Grant

1994 K1100RS
1981 R100RS
1978 R100RS
1928 Chevrolet tourer

www.montythe1928chevrolet.blogspot.com.au
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Scott_Anderson
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Joined: 05 Sep 2006
Posts: 3117
Location: Central Iowa, USA

PostPosted: Sun May 10, 2015 7:34 am    Post subject: Reply with quote

It could also be possible that your recent venture into the bike bowls exposed a problem sooner than later.
I have read about wires breaking for the ignition switch, where it comes up around the headstock and connects at the switch. Just simply caused by age and flexing from turning the bars over the years.

Not saying that the wiring is your issue, I also agree with Jim, clean and check any and all electrical connections you can get at, especially the motronic plug. I've been bit by that one in the past.
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1995 K1100LT 0302044
1997 R1100RT ZC62149
2017 FLHTK Ultra Limited
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"One who does not ask questions is ashamed to learn" Danish proverb
1997 K1100LT 0302488(R.I.P.)
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grant93
Flying Brick Rider


Joined: 23 Mar 2013
Posts: 238
Location: Victoria - Australia

PostPosted: Sun May 10, 2015 4:56 pm    Post subject: Reply with quote

Gidday Scott,

Yep understood mate, surprising the amount of wires under the tank area and they are small fine wires at that which would break easily..

I just restored my 1978 R100rs and installed a complete new wiring loom right through the bike, nice fat chunky wires compared to these K bikes..

Time to inspect a few and have a good look under the tank I think!!

Thanks for you input




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Cheers Grant

1994 K1100RS
1981 R100RS
1978 R100RS
1928 Chevrolet tourer

www.montythe1928chevrolet.blogspot.com.au
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Ted
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Joined: 03 Apr 2003
Posts: 1117
Location: Further

PostPosted: Sun May 10, 2015 11:50 pm    Post subject: Reply with quote

Check and clean the wiring connector for the tank, behind the right-side cover. It is responsible for both the fuel pump and the guage. CRC makes a great electrical connection cleaner available at Autozone, Pep Boys, etc. if you can't find the ones Jim mentioned.

This is a common problem easily remedied Smile
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Ted
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Mike d
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Joined: 19 Feb 2010
Posts: 130
Location: Daventry UK

PostPosted: Mon May 11, 2015 4:18 am    Post subject: Reply with quote

+1 on Ted's response.

That 4 pin connector becomes loose and can cause an intermittent failure.

You may need to squeeze the pins to improve the contact, or better still replace with a modern 4 pin waterproof connetcor.

Mike


Last edited by Mike d on Tue May 12, 2015 11:55 am; edited 1 time in total
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grant93
Flying Brick Rider


Joined: 23 Mar 2013
Posts: 238
Location: Victoria - Australia

PostPosted: Mon May 11, 2015 5:37 am    Post subject: Reply with quote

A+ for the responses and and tips Smile
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Cheers Grant

1994 K1100RS
1981 R100RS
1978 R100RS
1928 Chevrolet tourer

www.montythe1928chevrolet.blogspot.com.au
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Ted
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Joined: 03 Apr 2003
Posts: 1117
Location: Further

PostPosted: Mon May 11, 2015 8:27 pm    Post subject: Reply with quote

Mike d wrote:
You may need to squeeze the pis to improve the contact, or better still replace with a modern 4 pin waterproof connector


Mike is right on, lots of folks use trailer connectors. If you are at all handy with shrink wrap and a soldering iron (or like me, willing to buy a some scrap wire and practice with YouTube videos) you can have a totally stock-looking result.
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Ted
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