Charging system problem Need all the help i can get.

[yotadork83]

All right i have a 79 toyota that i changed the motor to a 22r. and i am still running the 22r alternator. the problem is that when i throtle on the motor the charge light goes on and when you let off it goes off. i was thinking that maybe the 20r syestem ran off of a negative circut and the 22r systen ran on a positiive circut or viseversa. i could use the help. thanks

[79coyotefrg]

um  no  the difference is the older 79 has a external regulator,  the newer alts have a internal regulator

i have a 22R  but run  the 79  alt  in the stock position and a celica  alt  on the pass side for all the extra's

[rocblaz]

if u did'nt change the wiring use ur old alt  u did'nt say what the new moter year is . so i'm guessing it's a newer alt .

[yotadork83]

the new motor and alternator is out of a 83. after i charged up the batty the light just stays on. the reason i dint use the old alt is because some body stole it off the orig inal truck.

[79coyotefrg]

is the 83  a external regulator  or internal??  does the plug  on the alt  have 3 wires or just 2

[yotadork83]

it has three and there is and the voltage regulator is on the fender wall. could changing the regulators back to an older one fix this the one i have is off of the 83.

[79coyotefrg]

if the regulators have the same plug and same number of wires then use the other one you have, if not get a new one

[rocblaz]

if i remember rite they change alt 2 or three times make sure the plugs are the same colors alt   green  to green  plug . if alt is brown  have to use brown plug . check ur plug wire that plugs in to alt . have to match .

[8D3TOY]

Just something to keep in mind I battled the charge/brake light problem for a while, changing out alt's messing with everything electrical, I finally gave up and took it to a pro, he informed me that the charge & brake light serve as a primitive "check engine" light.  He rebuilt my carb and replaced a bunch of vac. switches,lines,ect. nothing to do with the charging system and it is off now.  Every once an a while if I lug the motor down or if it pings heavily I'll see the charge light flicker, so maybe there is something to it.

[yotadork83]

all right the charge light stoped working now i was wondering were the charge light relay is hiding at i need help>