Randy Farrell

Hello to all. Today I noticed the passenger side head light was out on my 1982 euro. I went to replace it with one from my donor car but no luck. This is very strange when the three prong plug is off of the light it reads 12 volts, when the plug is on the light it shows 0 volts. I tried grounding to several places and three lights all with the same results any ideas would be great.

Speedtoys

Reading 12v doesnt mean there is any more current than what is needed to register on your DVM.

You need to find the resistance (voltage drop) in the circuit. Review the state of the connections un the circuit, including fuse(s), and CE harness connections...and...the ground(s).

The Forgotten On

Take off the rear cover and plug the harness directly into the bulb.

I had one of the covers corrode internally and stop passing current to the bulb. This is with a H4 headlight BTW.

Mrmerlin

First check the fuse,
the usual point of failure is in the harness where its clamped to the chassis, under the headlight
the flexing of the wires is where they break,
so take off the wheel and the fender block off plate turn on the lights then move the harness

Randy Farrell

Thanks for the replies guys. I have taken the connectors out of the plug and its so strange that I show the twelve volts until I connect to the light itself then nothing zero. I will look more after work today.

Randy Farrell

One more question do both headlights use the same fuse? The drivers side is working.

Alan

No each side and high beam and also low beam have different fuses (total of 4) - if neither high nor low work it may be the ground connection. What you have is high resistance in the circuit - and when you connect the very low resistance filaments - all the voltage gets dropped across the high circuit resistance which means virtually zero at the bulb. This can be a blown fuse that actually isn't completely blown or a break in the wiring that has a high resistance connection remaining. Change the fuses (don't rely on visuals). You can test the voltage at the fuse with the lights installed & on - the bottom of the fuse is the input, top is the output (on an '82)

Will help narrow it down


Alan

Randy V

There are links to fuse chartes in the FAQ sticky, as well as on the 928 International and 928 Specialists websites.

Randy Farrell

Thanks guys I cleaned the grounds and checked the fuses. I'm not sure what the problem was but problem solved.

Alan

Most likely a poor connection at the fuse

Alan