Will the ground stop working if the chasis is too hot?

**zachxp** · 09-05-2005, 02:21 AM

I'll check that out. I once had a problem with my car not starting on some days because the power connector on the battery came loose.

Can you ground to the negative pole of the battery?

**SAScooby** · 09-05-2005, 02:33 AM

your amp most likely is sensing a temp increase and going into "protection" mode
check if your amp has a little LED on it "prot" or "protection" or "thermal"

**zachxp** · 09-05-2005, 12:23 PM

No, I have seen it go in to protection mode before; the led turns red. In this case, the amp does not even get power.

**roadhog** · 09-05-2005, 11:32 PM

Do you have a multimeter or test lamp?

**zachxp** · 09-06-2005, 12:18 AM

I have multimeter.

**pancit175** · 09-07-2005, 04:21 PM

if you're not getting ant power, its been my experiance that your fuse might be bad. What kind of fuse do you have, AGU glass fuse i bet.
Check the continuity or resistance of the fuse, it should be zero resistance depending on how accurate your meter is. If there is a resistance present, you still get a measurement at the amp, but the resistance from the fuse drops the voltage during usage so the amp doesnt get the proper voltage to power up.
The connections within the fuse may be comming apart when the temperature reaches a certain point.

**roadhog** · 09-08-2005, 12:50 AM

Try this.

Set the multimeter to DC 20volts or more.
Connect the black - probe to the car battery - terminal.
Probe the AMP power wire at the fuse holder and then the connector. Confirm you have 12 volts approx.
Disconnect the black - probe

Connect the red + probe to the battery + terminal.
Probe any exposed metal part of the car to confirm you have 12 volts.
Probe the AMP - terminal at the connector. Confirm you have 12 volts.

Disconnect the Battery + terminal (you may lose Radio code, Engine data, reset Alarm etc)
Set the multimeter to 10 ohms or less.
Probe the Amp - terminal. Confirm the meter reads approx 0 ohms. Anything over 0.2 ohms indicates a problem with the ground.

As Turbocad said earlier, if the ground cuts out due to heat, it must be very poor to begin with.
To eliminate the possibility of a bad ground, check the following.

The ground wire is the same or greater guage as the power wire.
The ground terminal is clean and free from rust or corrosion.
The ground terminal is bolted to the bared metal chassis directly

To prevent corrosion, use vaseline or car battery terminal grease on the bare metal area.