Radiator Fan Issues

[Tomcomox]

Good day All,

!984 GL1200A, 93 kms, lots completed to date. I was on this forum earlier dealing with some fuel issues but all good now. Bikes runs , starts, but....

Before I put all the plastic back on I'm going over the bike to make sure all is in order and then this started happening.

I run the bike , bring it up to temp, 4 four bars on LED gauge radiator fan comes on, doing some voltage checks, 13.4 - spikes to 14 V at 3000 rpm. Then when I turn the bike off, hear fan operating I have no juice left in the battery to restart immediately after shut down, put charger on battery bike starts fine.

I know there s is a gremlin in there somewhere I just don't know where to start....I did have rad off to change timing belt, did i overlook something ?

Cheers,
Tom

[Rambozo]

Sounds like the battery has packed it in.

[WingAdmin]

Yup, sure sounds like a bad battery to me.

[Tomcomox]

Okay then ...

New August 2021, getting 12.5 V @ 900 rpm, 13.1V @ 2000rpm, 14.0 V @ 3000rpm. Will check it out and will let you know what I find, Thank you

Cheers,
Tom

[WingAdmin]

Okay then ...

New August 2021, getting 12.5 V @ 900 rpm, 13.1V @ 2000rpm, 14.0 V @ 3000rpm. Will check it out and will let you know what I find, Thank you

Cheers,
Tom

So that's what the bike's charging system is putting out, but if you have a bad cell in the battery, it might be looking "full" to the charging circuit, but not able to provide sufficient current when not being charged.

[Tomcomox]

Thanks,

Today's numbers :
idle - 12.6 V

2k - 14.7 V

3k - 15.2 V

Here I go....?

Cheers

[Rambozo]

Thanks,

Today's numbers :
idle - 12.6 V

2k - 14.7 V

3k - 15.2 V

Here I go....?

Cheers

As was mentioned that just tests the charging system.
Test the battery at 0 RPM

[Tomcomox]

Good day all,

Just letting you know, I'm finished playing with my 1984 GL1200 A...( for now ). I did just purchase a 1995 GW 1500 SE, voyager trike kit installed from an 85 year old gentleman that said it was time to let her go. Babied , clean and very low milage, 31,200 miles ( about 50,000 kms ) ... I couldn't pass it up.

Planning a Route 66 / cross country run this summer and thought I could get the GL1200 A ,up and running, but I wanted some "big" bike time before the trip.

The 1500 SE is big and quiet, running well, will go over it before the trip and of course the " trike " riding learning curve is progressing along well.

Once again thanks for all the inputs / suggestions /advice and just to give this forum fair warning I'm not gone for good.

Cheers to All,
Tom

[joecoolsuncle]

my 84 gl1200 turns off the fan when i turn off the key switch. it also doesnt turn on the fan untill about the seventh hash mark. 4 bars is normal running in cool weather (under 80) and 5 or 6 bars when its warm weather. the fan then only kicks on when in town. i have every reason to believe this is normal operation as honda intended. i would suspect you have some wiring/temp switch/previous owner issues.