Author Topic: RD400 wiring problem FINALLY SOLVED  (Read 2548 times)

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Offline TERRY REYNOLDS

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RD400 wiring problem FINALLY SOLVED
« on: November 08, 2012, 10:17:05 AM »
Can anyone tell me if when there is no key in the ignition should the 20 amp fuse connection be 'live'.It keeps blowing the fuse and if I put a multimeter on the fuse connectors it registers 12.7 volts with no key in ignition.The other two fuses connectors don't register anything when no key in ignition,cheers
« Last Edit: November 18, 2012, 12:59:57 PM by TERRY REYNOLDS »

Offline Hairy Scotsman

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Re: RD400 wiring problem
« Reply #1 on: November 08, 2012, 02:43:05 PM »
That's correct - the top 20A fuse is the main feed from the battery.
Connection goes from battery positive through 20A fuse then on to ignition switch. The bottom 2 fuses will only become live when the key is turned in the ignition switch.


Edit - If the 20A fuse keeps blowing - I suspect that you have a dead short somewhere, you have a live going directly to earth  :-\
« Last Edit: November 08, 2012, 02:46:25 PM by Hairy Scotsman »
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400F, 350LC YPVS NII

Offline Hustler

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Re: RD400 wiring problem
« Reply #2 on: November 08, 2012, 09:55:58 PM »
Is your 400. A c/d model? If so you may like to check the wires to the carbon brushes.
Hustler.

Offline TERRY REYNOLDS

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Re: RD400 wiring problem
« Reply #3 on: November 09, 2012, 01:46:34 PM »
Thanks for the replies,mine is an F model.I just changed the neutral switch cover which was cracked for one of the yambit kits,do you think that may be causing the short.The bike started okay with both neutral and oil lights on when they both suddenly went off but the engine kept running,after i turned it off the fuses kept blowing so now i cant start it

Offline miciver

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Re: RD400 wiring problem
« Reply #4 on: November 09, 2012, 02:10:59 PM »
My 400C one was cracked so I bought a yambits one, but it would not work at all since the brass contact was too small and not extended out enough.
I sent it back and got a refund, then fitted my original cracked one which worked ok, so maybe worth trying the original again first.  ;)
RD400C Marine Blue 1977
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Offline Hairy Scotsman

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Re: RD400 wiring problem
« Reply #5 on: November 09, 2012, 02:14:08 PM »
F's will run without a battery, I doubt that the neutral switch cover is doing it - All that the switch does is to connect the Neutral light to earth, completing the circuit, Even if you had trapped the blue wire between the engine & the casing all that would happen is the light would stay on constantly.
What you need to do is remove the battery, Remove 20A fuse, Switch Ignition to OFF,  then test for continuity between a good earth on the frame and both of the 20A fuse holders. If you get continuity you have a short & will need to check for bare wires etc
If you don't get continuity, that's as it should be & I'll need to get my thinking cap on again  ;D


HTH
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Offline TERRY REYNOLDS

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Re: RD400 wiring problem
« Reply #6 on: November 10, 2012, 04:03:17 AM »
Update!,the 20a no longer blows when I turn on the ignition but the 10a for the indicators at the bottom blows everytime I turn on the ignition.The lights work when I turn the key further round.When I turn on the ignition neither the oil or neutral light come on yet the bulbs seem okay.I will keep checking the wires!cheers

Offline mervin

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Re: RD400 wiring problem
« Reply #7 on: November 10, 2012, 09:01:59 AM »
By any chance have you fitted a new pattern loom?

I have had new front brake light switches blow fuses,
My wife says that I never listen to her, or something like that!

Offline TERRY REYNOLDS

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Re: RD400 wiring problem
« Reply #8 on: November 10, 2012, 09:41:09 AM »
I just got the bike so I don't know but looking at the wiring I think a new loom may be the only answer!.I have unclipped every thing connected to the brown wire circuit one by one and tested the ohms,it keeps coming up with .oo1 so something is causing an earth somewhere I believe
« Last Edit: November 10, 2012, 09:48:03 AM by TERRY REYNOLDS »

Offline charlie campbell

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Re: RD400 wiring problem
« Reply #9 on: November 10, 2012, 04:04:19 PM »
has anyone got a wiring download for an american model,or are they the same?
thank's

Offline mervin

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Re: RD400 wiring problem
« Reply #10 on: November 10, 2012, 05:30:05 PM »
yer tiz on the old aircooled rd .com site

http://www.aircooled-rd.com/RD400USwiring.pdf
My wife says that I never listen to her, or something like that!

Offline TERRY REYNOLDS

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Re: RD400 wiring problem
« Reply #11 on: November 11, 2012, 06:36:35 AM »
Checked all the wires,disconnected everything attached to loom one by one,even took whole loom off bike,put all back together,no different,still blowing 10A indicator fuse,anyone any other thoughts,getting me down now :'(

Offline charlie campbell

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Re: RD400 wiring problem
« Reply #12 on: November 11, 2012, 07:51:19 AM »
thanks for the download,thats going to be really handy.

Offline TERRY REYNOLDS

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Re: RD400 wiring problem
« Reply #13 on: November 18, 2012, 12:58:56 PM »
Finally found the problem,ended up being a faulty flasher cancel unit,it kept shorting out intermittently but finally started smoking today!   Luckily the indicators work without it as not available new anymore,thanks for the replies