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1977 500 GTL wiring issue

Posted: Mon May 29, 2017 12:48 pm
by d907ie
I just bought this bike and it has an after market (I believe) regulator. There are 3 wires coming from the alternator, but only 2 are connected to this regulator. The 3rd (red/black) is extended and connected to positive post of battery. Bike is not charging battery, hence my search for the reason. I wanted to see if the alternator was sending enough volts and was looking for connection points (this new regulator doesn't have exposed connectors, only wires coming out). So, I see the red/black wire NOT going to the regulator and thought that was strange. Now I need help. I can't find a wiring diagram, nor any posts to help. Many thanks for any help. peace

Re: 1977 500 GTL wiring issue

Posted: Tue May 30, 2017 2:06 pm
by BevHevSteve

Re: 1977 500 GTL wiring issue

Posted: Tue May 30, 2017 6:23 pm
by d907ie
Thanks, Steve! I see a couple differences between the diagram and what is in front of me, but I will see how things go while I try and make mine look like the diagram. I will let you know how I fare:-). peace

Re: 1977 500 GTL wiring issue

Posted: Wed May 31, 2017 12:10 pm
by d907ie
Steve,

I believe this is an after-market regulator that came from Bevel Heaven. Pictures show 6 wires, where the stock regulator in the diagram shows 4. Only the 2 yellow wires from the alternator are connected to the regulator. The red wire from alternator is connected to the battery...too weird.
IMG_0159 (3).JPG


IMG_0159 (3).JPG
Any ideas? peace

Re: 1977 500 GTL wiring issue

Posted: Wed May 31, 2017 12:22 pm
by BevHevSteve
you can download the wire diagrams for the 2 different aftermarket regs I stock easily enough...

ESR510 https://store.bevelheaven.com/Install-G ... tructions/

Ricks https://store.bevelheaven.com/Install-G ... tructions/

Re: 1977 500 GTL wiring issue

Posted: Wed May 31, 2017 5:08 pm
by d907ie
Thanks, yet again, Steve!
I will make sure the set-up follows your diagram (many thanks). Back to the site with an update.....soon:-) peace

Re: 1977 500 GTL wiring issue

Posted: Thu Aug 03, 2017 10:41 am
by d907ie
It must be in the air, both Italian vehicles are having electronic issues :|
On the Ducati, I am at a stand-still. There are 6 wires coming from after-market Regulator and the wiring diagram from Steve only shows 5. AND, not the same colour code. If you look above, you will see the wires. This previous owner took the 2 yellows from Alt. and joined them with the 2 from regulator. The red from alternator was left "hanging". The black from regulator goes to negative, battery. The 2 reds from regulator go to positive side of battery. The white from regulator "hangs". Since this bike is a 3-wire alternator, the previous owner must have decided to follow the 2-wire diagram.

My question, Steve: With the set-up I received the bike in, and if the alternator is good, will the battery be charging while engine runs...again, based on the wired set-up. OR, is there another wiring diagram for the regulator that shows 6 wires and what to do? Many thanks, Steve...or anyone else:-)

The Gen. light stays on and battery went down on last ride.

Re: 1977 500 GTL wiring issue

Posted: Sat Aug 05, 2017 8:35 am
by d907ie
Ah!!! I forgot all about Rick's diagram. Completed the wiring...so sorry for the last post. Not getting the alternator to charge has been frustrating and impossible to find another alt. peace