CBR 600F 1987 - 1990 CBR 600F Forum

87 hurricane fuel pump wiring failure

Old Apr 29, 2025 | 03:23 PM
  #11  
Moonlight2391's Avatar
Thread Starter
|
Member
Joined: Jun 2024
Posts: 85
Likes: 9
Default

Originally Posted by Ed Harris
As with all things electrical the multimeter is your friend. Measure the voltage from the input side to earth and measure the voltage from the output side to earth, they should both read the same and be the same as the battery voltage.
just had the battery tested, surprisingly it's completely fine which means its gotta be the fuze box, i have it apart again does everything inside of it look fine? So for the test all i gotta do is measure all of the wires going in and out of the fuze box to earth?

 
Reply
Old Apr 29, 2025 | 03:41 PM
  #12  
Ed Harris's Avatar
Senior Member
Joined: Jul 2023
Posts: 466
Likes: 124
From: UK,East Midlands
Default

Originally Posted by Moonlight2391
just had the battery tested, surprisingly it's completely fine which means its gotta be the fuze box, i have it apart again does everything inside of it look fine? So for the test all i gotta do is measure all of the wires going in and out of the fuze box to earth?
Looking will pick up obvious faults but cannot show you that it works - I.e. it will prove a negative but not a positive, for that you need a multimeter.

So yes, black lead to battery negative, red lead as a flying probe to check either side of each fuse, especially fuse G which supplies the ignition.
 
Reply
Old Apr 29, 2025 | 03:49 PM
  #13  
Moonlight2391's Avatar
Thread Starter
|
Member
Joined: Jun 2024
Posts: 85
Likes: 9
Default

Originally Posted by Ed Harris
Looking will pick up obvious faults but cannot show you that it works - I.e. it will prove a negative but not a positive, for that you need a multimeter.

So yes, black lead to battery negative, red lead as a flying probe to check either side of each fuse, especially fuse G which supplies the ignition.
with key on red wire/black wire coming from igntion to fuse box = 12
Fuse= 11.97
black wire coming out =11.97
 
Reply
Old Apr 29, 2025 | 05:37 PM
  #14  
Ed Harris's Avatar
Senior Member
Joined: Jul 2023
Posts: 466
Likes: 124
From: UK,East Midlands
Default

Originally Posted by Moonlight2391
with key on red wire/black wire coming from igntion to fuse box = 12
Fuse= 11.97
black wire coming out =11.97
So the drop is before the fuse box.

Go back to the Red / Black wire on the fuse box connector then the R/B on the ignition switch connector, then the ?Black? in the ignition switch connector then the black on the starter relay then the 30a fuse by the starter relay.
 
Reply
Old Apr 29, 2025 | 05:56 PM
  #15  
Moonlight2391's Avatar
Thread Starter
|
Member
Joined: Jun 2024
Posts: 85
Likes: 9
Default

Originally Posted by Ed Harris
So the drop is before the fuse box.

Go back to the Red / Black wire on the fuse box connector then the R/B on the ignition switch connector, then the ?Black? in the ignition switch connector then the black on the starter relay then the 30a fuse by the starter relay.
Red/black at ignition=12.06 key on key off = 0
solid red at ignition switch = 12.50 key off 12.10 key on
brown at ignition switch = 11.60 key on key off = 0
brown/white at ignition switch = 11.60 key on key off = 0
Im not seeing any black wire on the ignition switch, are you talking about inside the start/kill housing by chance? How do I test the 30 amp fuse while everything is connected?
 
Reply
Old Apr 30, 2025 | 01:44 PM
  #16  
Moonlight2391's Avatar
Thread Starter
|
Member
Joined: Jun 2024
Posts: 85
Likes: 9
Default

Originally Posted by Ed Harris
So the drop is before the fuse box.

Go back to the Red / Black wire on the fuse box connector then the R/B on the ignition switch connector, then the ?Black? in the ignition switch connector then the black on the starter relay then the 30a fuse by the starter relay.
ok i made some good progress on it, i threw in a buddies new lithuim battery and i get the full volts on thr black wire at the relay, but it still was not working and I decided to jump the black and the blue wire at the relay and when the key comes on the pump comes on for now, I tried to messaure continuity, voltage, and resistance on the relay and got nothing am I doing these tests correctly? Also, is there a way to test the yellow/blue wire at the relay to make sure it is supplying the relay with the pulses?
 
Reply
Old Apr 30, 2025 | 02:22 PM
  #17  
Ed Harris's Avatar
Senior Member
Joined: Jul 2023
Posts: 466
Likes: 124
From: UK,East Midlands
Default

Originally Posted by Moonlight2391
Red/black at ignition=12.06 key on key off = 0
solid red at ignition switch = 12.50 key off 12.10 key on
brown at ignition switch = 11.60 key on key off = 0
brown/white at ignition switch = 11.60 key on key off = 0
Im not seeing any black wire on the ignition switch, are you talking about inside the start/kill housing by chance? How do I test the 30 amp fuse while everything is connected?
OK, so you’ve found the drop - either in the ignition switch or in the connector to it, contact cleaner should help :-)

Sorry about the colour error, I’m having to use a magnifying glass to try to read the &#&#&#& copy of the wiring diagram I have.
 
Reply
Old Apr 30, 2025 | 02:26 PM
  #18  
Moonlight2391's Avatar
Thread Starter
|
Member
Joined: Jun 2024
Posts: 85
Likes: 9
Default

Originally Posted by Ed Harris
OK, so you’ve found the drop - either in the ignition switch or in the connector to it, contact cleaner should help :-)

Sorry about the colour error, I’m having to use a magnifying glass to try to read the &#&#&#& copy of the wiring diagram I have.
im pretty sure what it was is even though i had 2 different places test the battery there is many test that they can't do to it, like activate the magnetic coil for the fp relay. I guess after sitting a whole year the battery is no good no more.
 
Reply
Old Apr 30, 2025 | 02:27 PM
  #19  
Ed Harris's Avatar
Senior Member
Joined: Jul 2023
Posts: 466
Likes: 124
From: UK,East Midlands
Default

Originally Posted by Moonlight2391
ok i made some good progress on it, i threw in a buddies new lithuim battery and i get the full volts on thr black wire at the relay, but it still was not working and I decided to jump the black and the blue wire at the relay and when the key comes on the pump comes on for now, I tried to messaure continuity, voltage, and resistance on the relay and got nothing am I doing these tests correctly? Also, is there a way to test the yellow/blue wire at the relay to make sure it is supplying the relay with the pulses?
Wonderful, that is good progress and strongly suggests a faulty relay and a duff battery.

Yes, but only with specialist equipment like an oscilloscope or an integrating meter. It’s more a case of replace the faulty components and see if it works.
 
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Moonlight2391
CBR 600F
13
Sep 16, 2024 06:58 AM
Hackbart
CBR 1000F "Hurricane"
5
Nov 12, 2019 10:49 AM
Thinkey
CBR 600F
15
Aug 29, 2012 10:05 AM
jp_greenville13
F4i - Main Forum
31
May 15, 2011 12:40 AM
k2comer
General Tech
1
Dec 4, 2007 06:28 PM


Thread Tools
Search this Thread

All times are GMT -5. The time now is 01:59 AM.