I haven't seen this one Before!!

[mflugel]

I have been having a problem with the driver's low beam head light on my '85 spider.

I have 12 volts at the connector at the headlamp for both high and low beams

The high beam works fine.

When I connect to the headlamp the voltage on the connector drops to zero.

It seems that when I put the circuit under load, the voltage drops to nothing. When I unhook the connector, the voltage goes back to 12 volts.

I have also put jumpers out of the connector and manually connect to the headlamp. On the high beam circuit, the 12 volts stays consatnt and I can light either high beam or low beam by switching the jumpers to the headlight terminals.

When I hook the jumpers up onn the low beam circuit, the voltage just drops to zero when I touch them to the headlamp terminals.

Do you guys have any Idea what might be going on here?

Thanks for any input on this.

Mark

[pillowmeto]

Maybe a short in the light bulb, putting the passenger bulb on that side and see if it works.

if i had a 12 volt battery fully charged and put my voltmeter on the +&- terminals id get a reading of 12v, if i then connected those terminals with a piece of wire I would get 0v. A short in the light bulb could be like that piece of wire.

[mflugel]

Quote:

Originally Posted by pillowmeto Maybe a short in the light bulb, putting the passenger bulb on that side and see if it works. if i had a 12 volt battery fully charged and put my voltmeter on the +&- terminals id get a reading of 12v, if i then connected those terminals with a piece of wire I would get 0v. A short in the light bulb could be like that piece of wire.

[Alfacliff]

the voltage dropping when the bulb is connected is due to a bad or corroded connection high resistance drops the voltage under load, but your meter isnt enough load to drop the voltage. check the fuse box for good connections, there are seperate fuses for high and low beams.
cliff