Author Topic: Electrical Gremlins No battery power or cranking  (Read 754 times)

0 Members and 1 Guest are viewing this topic.

Aerobhoy

  • Guest
Electrical Gremlins No battery power or cranking
« on: March 18, 2009, 11:02:13 PM »
 Ist off let me fill you in a bit of history I've recently bought my 76 CB750 which had been sitting is a dry storage facility for at least 10 yrs,
I've checked out the engine is free and turns over, new battery installed cleaned fuse holders and installed new fuses, cleaned out gas tank, replaced fuel filter. spark plugs

Problem is i have no ign, or lights, When i hook up new battery, one flasher left rear comes on and dash lights come on. Other than that i have nothing. I can however get the engine to crank after jumping the starter solenoid
(so my ign switch, wiring, starter switch or solenoid may be no good)

I'm planning on installing new points plug wires  after i make shure i have spark etc

anything you can recommend i check or is there any common problem i may be missing
Im shure someone may have had similar issues. Is there a fusible link anywhere other than the 3 fuses behined left side cover?

I'm trying to get the IGN Cranking problem done 1st before i go onto one of the many other things needing to be done.

thanx in advance
Jimmy O

Offline bryanj

  • Really Old Timer ...
  • *******
  • Posts: 14,133
  • CB500 Number 1000036
Re: Electrical Gremlins No battery power or cranking
« Reply #1 on: March 19, 2009, 05:09:55 AM »
You need:-

Manual with wiring diagram

Voltmeter or test bulb

Time and patience
Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

Remember "Its always in the last place you look" COURSE IT IS YOU STOP LOOKIN THEN!

Offline Spanner 1

  • Old Timer
  • ******
  • Posts: 4,092
  • CB 750 K0 ( always thought it was a K1!) + CB750K8
Re: Electrical Gremlins No battery power or cranking
« Reply #2 on: March 19, 2009, 09:28:37 AM »
The starter button carries 'hot' to both the headlight and the starter relay ( solenoid )...I'd start there...should be voltage at solenoid yellow/red tracer terminal when starter button is pressed...when 'on' all 4 wires at ign. sw should be hot...black should be hot throughout the bike with key 'on'... some stuff to try first, there's lots more.....
If your sure it's a carb problem; it's ignition,
If your sure it's an ignition problem; it's carbs....

Aerobhoy

  • Guest
Re: Electrical Gremlins No battery power or cranking
« Reply #3 on: March 20, 2009, 05:14:09 AM »
 Thanx Guy's ive just scored a Parts manual and Genuine Honda service manual on e,bay so i'll be better able to get down to fixing things
appreciate the quik responces

Jimmy O

Offline 78CB750CAFE

  • I'm not really an
  • Expert
  • ****
  • Posts: 960
  • Ride, wrench, repeat.
    • Drewfus Nation, my podcast, bicycle collection, blog etc
Re: Electrical Gremlins No battery power or cranking
« Reply #4 on: March 20, 2009, 09:23:56 AM »
Thanx Guy's ive just scored a Parts manual and Genuine Honda service manual on e,bay so i'll be better able to get down to fixing things
appreciate the quik responces

Jimmy O

OOHHHH...
You should have searched the site a little further, you could have gotten PDF's of both for free in the FAQ section I believe
"I believe in the bodies, I believe in the blood, I believe in salt around the rim of the glass because it makes us thirsty, and when we drink, then we all fall in love"
-212 Margarita by The Hold Steady
Build thread:http://forums.sohc