Back at it, want to install voltage regulator from 1970s CB

hillhudson · Post by **hillhudson** » Sat Feb 16, 2013 5:47 pm

Hey all, I've fried two lithium ion batteries cause they are so sensitive to over voltage charging, the cb77 never had a voltage regulator because it used the led acid battery to regulate I assume, so anyone know where I should start when trying to wire in a newer cb 12v regulator ?

Thanks

Hill

Cb77

hillhudson · Post by **hillhudson** » Sat Feb 16, 2013 9:36 pm

What lead on the cb77 wrin harness charges the battery? Anyone ?

Thanks

mike in idaho · Post by **mike in idaho** » Sat Feb 16, 2013 9:37 pm

Black wire goes to switched daytime running voltage, green to ground and yellow goes to the a/c(lighting coil) pink wire.

hillhudson · Post by **hillhudson** » Sat Feb 16, 2013 11:19 pm

hey thanks for the reply, i'm thinking of trying this guy out to regulate and rectify. any thoughts on weather this is a bad/good idea?

thanks a lot.

heres a link to my cb77 on pipeburn.com

http://pipeburn.com/home/2012/6/26/1966 ... -cafe.html

G-Man · Post by **G-Man** » Sun Feb 17, 2013 3:29 am

Hiil

You could go the minimalist route and fit one of these.

http://www.ebay.co.uk/itm/Lucas-12v-Zen ... 7675.l2557

Just regulates the battery voltage by chopping anything above a nominal 12v (prob 13.6 ish)

G

hillhudson · Post by **hillhudson** » Sun Feb 17, 2013 3:36 am

G-man, that sounds Great, I actually found out a buddy has that rectifier/regulator I posted a link to above, I'm going to try it out and take some readings with the multimeter. Ill report back soon! P.s. check out my post on my "speedo resto" thread. Posted a new odo rebuild

Cheer! And thanks

mike in idaho · Post by **mike in idaho** » Sun Feb 17, 2013 10:16 am

If you use a Lucas zener diode, it won't work for you unless it's negative ground. The one in the ebay ad appears to be positive ground, since the heat sink is off a '68-'70 Triumph. Get the one for the late T140(750ccs), it's negative ground.