1979 gl1000 sluggish starter

[firagate]

ok so i just bought a 1979 gl1000 ive been working on it for a little over a week
i have a voltage problem i know allot about bikes i removed the spark plugs the motor turns over great the carbs are clean no problem there
but when i put the spark plugs back in and try to turn her over i cant get enough voltage to have a constant turn over with the motor i have a voltage meter on the bike and it goes up and past 12 volts i though it was the battery so just to see i used a 12 volt car battery that works but no go still sluggish now this bike has been sitting for a unknown amount of time but i know the starter has been replaced and is new
the main thing is every time i go to turn her over the voltage on the bike drops fast even with a good car battery
any suggestions im stuck and could really use the help

[wingman12]

Good morning and welcome to the best site available. If you are sure that the starter is (new) or close to new, I would begin by checking your ground connections, 1st one neg side of battery to chassis, often times these get corroded and cause issues, perhaps the ground cable it self is bad. Check the starter relay and connections. last resort pull the starter and clean and inspect. Please keep us posted. There will to others jumping in with additional suggestions.

[redbug]

Use your jumper cables and extra battery and jump directly from the starter and see if that makes a difference. Are all your connections tight and clean (including grounds), have you charge the cycle battery and had it tested? When you jump to the starter and it still drags, pull the starter and check for sticking, worn brushes and lots of gunk. Thanks for stopping by and keep us posted. There are lots of posts on starters in the 1000 section also.

[firagate]

ok ill give them a go and let you know thanx