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Ah Disaster !!!!

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Razorsmile

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RC Driving Style
Ok guys thanks for all the help so far but again i have a problem:
I'm still running the stock savage 21 ( almost ) at the moment but
the other day i replaced the standard battery pack you get with the savage 21 in the UK, with a humpback rechargable battery pack ,
the car was running fine with the humpback connected to the channel 3 socket in the receiver ( is this right ) ?????
, but i cut down the connector on the humpback ( as it was a 3 pronged connector but only had 2 wires to it )and connected it to the normal battery connector and POOOF lots of smoke

I've managed to blow the steering servo and i think the drive servo as well .
( MUPPET!)
the servos are HPI SF-1 and i think SF-2 , is there a difference??
I've read the previous post about servos but the guy was saying money is no object etc .
is there a upgrade to the standard servos ?? and how can i stop them from blowing again ?
i sadly dont have alot of cash this time to replace them them better ones but any advice would be helpfull

thanks again and again in advance
TA!
 
the battery pack wire only needs 2 wires the hot and the ground. the black and the red wire. are you sure when you plugged the wire in that the black/ground wire was on the outside?

you cut the prong down? thats were you fried the thing cause the connectors prolly touched each other. you should have just left it alone and plugged it in with the black wire on the outside. the white wire that wasn't on the battery pack wire is a neutral
 
the connector i cut down had nothing in it ?
i wouldnt have cut it down otherwise , can i connect a battery directly into the receiver?
the 4x cell normal battery pack has only 2 wires red/blck and connects into the switch
the humpback has the 3 connector on it , so it wouldnt plug anywhere except into the receiver is this alright for the future after i replace the servos and a new humpback of course?
 
The SF-1 is the steering I beleive (I'm not sure, my savage was the SS) and the SF-2 is the throttle (again not sure) The steering servo has more torque than the other, and it is metal-geared unlike the other.
 
SF-2 is the stock steering. SF-1 is the stock T/B. I'm suprised you didn't get smoke when you plugged the pack into channel 3!!! You can bypass the switch and go straight to the rx, it would be like having the switch turned on. Are you sure you smoked the servos? I would think its the reciever with the problem after something like that.
 
Actually in most cases, plugging the switch into the 3rd channel is fine. People do it because it delivers more power to the servos than if you were to plug it into the batt slot.
 
cvec7 said:
Actually in most cases, plugging the switch into the 3rd channel is fine. People do it because it delivers more power to the servos than if you were to plug it into the batt slot.
Click to expand...

Hmm, never heard of that. I'll do that when I feel like changing radios. It sounds like maybe a defective receiver and/or battery. How long did that radio run on regular batteries. What could've happened is the radio was "used to" say 4.8 volts decending. Now you were feeding it 6 volts steady.

What happens is your capacitors/resistors overheat, expand, contract when not in use, then break connection OR short out.

Just my :2cents:
 
yo cvec actually you can plug the batt pack into the 3rd channel bypassing the limited amount of 4.8v with some receivers. i know that the rs300 reciever battery slot only puts out 4.8v and nothing more even if its a 6v batt. so some thinking they are getting 6v when they are only getting 4.8v, which you can bypass the limiter in the batt slot by plugging the batt into the 3rd channel to get the full 6v.

its what i had to do when i had the rs300 receiver. i sold it and am now running the xxtra synth receiver by novak. it has 5 slots and I'm only using the 2 for sterring and throttle/brake.

just make sure the black wire is on the outside.
 
Servos are probably fine, buy a new receiver and get the right switch, buy one a "Y" shaped one so you have a charging lead so don't have to open up the servo/rx/battery compartment everytime. Your LHS should point you in the right direction.

I have never heard of anyone routinely plugging a batt pack (as suggested above) into a 3rd Channel on a non-BEC receiver and its certainly not something I would recommend. There is a dedicated socket on your rx for the power supply (IE battery) I'd use it!!
 
it was definatly smoke from the sterring servo , the receiver pack was way outta the way when i plugged the pack in , i managed to try the rec and servos last night.
when i connect the steering servo theres nothing dead to the world
the throttle/brake servo only seems to pull forward not backwards now ( for the brake)
so i think its definatly the servos , at least the sf1 steering servo at least.
so from what i can tell , looks like I'm replacing at least the 2 servos
 
So if you have your battery pack on ch 3, can you use the 3rd channel switch on your radio to turn the truck on/off?
 

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