SOHC.co.uk Forums > CB500/550

Battery Draining

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deltarider:
 
--- Quote ---I will try your test.
--- End quote ---
So this simple test is done without the motor running, enginekey off and will tell you how many amps are drawn. Do not attempt to start! When testing you could open and close the killswitch but I doubt you'll see any difference as the killswitch receives power via the ignitionkey. On the other hand you never know. Please report back.

florence:
thanks DR, I will have to charge the battery a little first, then will get back later,

Lobo:
Hi Florence,

Further to DRs comments, and assuming the wiring is unmodded - same as CB750 which I'd reckon likely...

The battery in the OFF position is hard wired to..
(1) the stater motor relay
(2) the rectifier
(3) the ignition switch.

As DR says, put a meter (Amps setting) between the battery main +ve post, and the detached main RED. NO current should flow, ie the meter reads 0.

IF you have a drain...
(1) try disconnecting the stater relay in case there's an earth leak there
(2) try disconnecting the rectifier (large plug, 3 yellows, red(striped?), green)
(3) take out the main fuse... ie feed to the ignition.

If #3 above is the culprit you'll have to start looking at earth leaks in the switch itself or its feed...often the fuse holders themselves are dirty / corroded / the culprit so perhaps have it out and give it a good clean.

If none of the above put the battery in the bench overnight & check before / after voltages just in case you've been sold a duffer.

Good luck,
Simon.

wolfheze:
Would have thought the most likely reason is that the battery is knackered. Could have sat on a shelf for years.

Spitfire:
I recently fitted a nice new battery, worked great, then it went flat, connected up to the Optimate and it said forget it, the battery was U/S. The strangest thing was that I then topped up the old battery, charged it and hey presto it worked, not perfect but it got me through this summer.


Cheers

Dennis

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