Main fuse blowing?

[Tryhard]

Help please. I have a '83 gsx750 es. I experienced a flat battery. So I gave her a boost charge and away I went for a two hour blat.
The following week I went to go for another ride with some m8s and the F**kn thing was flat again. So I charged her again on a automatic charger and left it over night. The next day I hooked up the battery and started her up. Cool. After two minutes there was silence. All dash lights etc dead.

After investigation I found that the main fuse (15amp) had blown. I had a close look and thought 'O"well they all look old and crusty.
I went to my local Super Rip Auto and bought some fuses.
Got home and chucked one in and pop. Blown again. WTF!

Hmm I un bolted the battery put the fuse in and took out the key. Then I connected the battery and pop another fuse down.
I looked for frayed wires etc nothing obvious.

Wold it be fair to say that my voltage regulator has sucked the kumera?
How do I test it? Could it be something else?

[FJRider]

Help please. I have a '83 gsx750 es. I experienced a flat battery. So I gave her a boost charge and away I went for a two hour blat.
The following week I went to go for another ride with some m8s and the F**kn thing was flat again. So I charged her again on a automatic charger and left it over night. The next day I hooked up the battery and started her up. Cool. After two minutes there was silence. All dash lights etc dead.

After investigation I found that the main fuse (15amp) had blown. I had a close look and thought 'O"well they all look old and crusty.
I went to my local Super Rip Auto and bought some fuses.
Got home and chucked one in and pop. Blown again. WTF!

Hmm I un bolted the battery put the fuse in and took out the key. Then I connected the battery and pop another fuse down.
I looked for frayed wires etc nothing obvious.

Wold it be fair to say that my voltage regulator has sucked the kumera?
How do I test it? Could it be something else?

I doubt if it's the regulator if it pop's by just hooking up the battery. Sounds more like it's shorting out somewhere.

The battery going flat indicates it's either buggered .... or there is a drain/short from it

[Tryhard]

I doubt if it's the regulator if it pop's by just hooking up the battery. Sounds more like it's shorting out somewhere.

The battery going flat indicates it's either buggered .... or there is a drain/short from it

I Hope your right m8. Guess I should grab a meter and start testing for conductivity? The old beep beep thing right

[FJRider]

This may sound strange ... but hook up the battery in the dark, A short may be able to be seen.

First thing though ... try hooking up a known good battery. (even with jumper leads from a car battery)

[spanner spinner]

from the symptoms you have discribed it could be the reg/rec. The reg/rec is permanently connected across the battery even when the ingition is turned off, the diodes and scrs inside it usally stop it discharging the battery when the bike is not running. When they go faulty the discharging of the battery when sitting and blowing of the main fuse are common. unplug the reg/rec and see if the issues go away.

[Tryhard]

from the symptoms you have discribed it could be the reg/rec. The reg/rec is permanently connected across the battery even when the ingition is turned off, the diodes and scrs inside it usally stop it discharging the battery when the bike is not running. When they go faulty the discharging of the battery when sitting and blowing of the main fuse are common. unplug the reg/rec and see if the issues go away.

Thanx for the suggestion I will try after work tomorrow night

[Tryhard]

from the symptoms you have discribed it could be the reg/rec. The reg/rec is permanently connected across the battery even when the ingition is turned off, the diodes and scrs inside it usally stop it discharging the battery when the bike is not running. When they go faulty the discharging of the battery when sitting and blowing of the main fuse are common. unplug the reg/rec and see if the issues go away.

Hmm uplugged the rectifier and no fuse blow! Any thing else I should check prior to getting a new one?

[spanner spinner]

yep check the stator feed, should be three yellow wires (are some times white or black but mostly there yellow). Get a mulitmeter check for contact from the yellow wires to the engine cases there should be none. Check across the yellow wires with the meter set to ohms looking for 0.5 to 1.5 ohms. Then start the bike and check the voltage output. This will be AC voltage, should be more than 15 volts at idle and more than 50 volts at half redline revs. if it fails these tests the reg/rec has cooked the stator and it will need to be either rewound or replaced.

[Phreak]

Make sure your battery terminals are nice and tight... From experience if they're loose they cause havoc with everything electrical...

[Tryhard]

Thank u all for your input. I tested the rectifier (well a m8 did) It was as suspected ROOTED. I got a second hand unit of an old gsx. I got the old wire brush on to it and cleaned it up. I fitted it with some heat shrink and solder. It looks sharper than the last one. Touch wood all good. U know wot I will b doin on the weekend..............