i have one of those cheap testers that look like a pen.

what parts of the car can i clamp the clamper down to?

what part do i touch with the tip, the positive or negative?

will it still work with solder on it?

 

what are you talking about?

post up a pic or a link and what is it sapossed to do?

 

those electrical tester to see if things are wired correctly and a light will turn on

 

a probe? usually test lights dont have a clamp

 

 

What are you trying to test?
Usually, the clamp goes on a ground point and the probe on the wire you are testing for power. If youre testing a ground wire then its reversed.
Its just a test light - you complete a circuit and the light comes on. I made my own out of wire and a bulb.

 

can you clamp it to any bolt in the car? will it still test if there is solder on the wire?

 

If you are checking to see if a wire has 12 volts then place the clamp on a known good ground and probe the wire. If it lights up then you have 12 volts on that wire. If you are checking for ground on a wire then put the clamp on a known 12 volts and probe the wire. If it lights up then theres your ground. Hope this helps

 

yes solder is conductive

 

It needs to be a bolt that is attached to the chassis (metal to metal contact), not say one of the screws that holds the interior plastic together.
Electrical solder is conductive, so yes.