My Doc friend brought me his car. Said he tried to junp start it, heard a buzzing noise in the glove box area. He installed a new battery, now has a 1500 rpm idle and ABS light on ... not sure they are related .

I replaced the idle speed controller behind the glove box (i bought the controller on Ebay, was advertised as new). The fuse labelled idle control in the fuse panel is good. I have no voltage at the idle control valve under the hood by the thermostat housing.

Is there another fuse I'm missing? Which terminals on the connector for the idle speed controller should I check for voltage?

Thanks, Grant, Grand Blanc, MI

yea, the overvoltage relay.
r rear eng comp.

george

I took it off, removed the back. The fuse is blown and the diode was burned in half. I attempted repair but was unsuccessful. I will try a new relay and let you know.

Suggest a source for the relay, other than the dealer?

Thanks, Grant

maybe a local mb shop but dealer shouldn't be too bad.

george

perhaps I'm looking for the wrong part? The part I removed looks like a small chrome box. The back cover plied off. Three wires to it, red, blue, green. Has a fuse inside, a diode and a large set of points. Has a thumb screw on the top to adjust point contact. Is attached to the firewall with 2 screws. It is hardwired into the OEM harness, no plug or connector.

When I look for an overvoltage relay for the car on the web, I get a picture of a small cube shaped relay that plugs into a connector.

What am I looking at / what am I suppose to be looking for?

Thanks, Grant

not sure what your looking at but it sure needs to be replaced.
the overvoltage should be on top of the fuse box. square relay
with a red top. no fuse to replace. must replace the relay.

george