I think I got all the lights working properly last week. The trouble was caused by poor grounding due to to the quicky paint job the previous owner had done. They failed to re-use the star washers that bite through paint to metal where the ground wires attach. Sounds simple, but can be a real bear to figure out.

It was a good lesson for my son: When you have several weird electrical problems (lights that sort of work, but not properly; dash indicators that stay on; and some lights that do not work at all) You need to check the grounds first. Nothing like a bad ground or two or three to cause weird stuff...

However, I need to know if the rear sidemarker lights are supposed to blink with the turn signals like the front sidemarkers do? My rear sidemarkers do not blink.

Along similar lines; should the blower fan be constantly on when the key is on, no matter what position the fan and heater and a/c levers are in?

I am suspecting it should not be on constantly, and that the problem might lie in a bad blower resistor in the evaporator box since the blower only has one speed.

Any thoughts on these matters?

I'm not that familiar with the 73 wiring but the 2nd GEN side markers, 72 and up, are supposed to blink with the Tail Lights - ONLY the 70 the side markers did not blink. My 70 has a Ballast Resister for the Fan Motor mounted inside the cab located approximately behind the Glove Box. It's possible you have a faulty Heater SX or a wiring issue there.

I don't recall any rear side markers that blink with tail lights. At some time GM decided that the blower motor would run all the time even in the "off" position. I'm not sure when they started and when they stopped as I don't think my 98 runs in the off position. If you only have one speed (assuming it's not high) I would check the connections for corrosion from the blower motor back to the resistor then back to the switch. I think they is a blower relay and a separate inline fuse for the highest speed on A/C cars.
Hope this helps!

Jeff

In 71 the Side marker lights flash with turn signal lenses - Check NastyZ28 Site: http://www.nastyz28.com/camaro/camaro71.php

I believe in 72 Air Conditioning was introduced to the Z28 as there were no longer Solid Lifters and Power Windows introduced in 73.

I do recall some GM Heater Blowers running constantly at low speed but I don think it is correct maybe the Air Conditioning Clutch has something to do with it.

[quote=Z15CAM;1066648]In 71 the Side marker lights flash with turn signal lenses - Check NastyZ28 Site: http://www.nastyz28.com/camaro/camaro71.php[quote]
I read it I don't believe it. I know the front flashed with the T/S, but never recall seeing any car that the rears flashed with the T/S. One of the experts is gonna haveta post a video to convince me, maybe several different cars.
Just my .02

Jeff

Jeff: Yah My 70 side markers don't flash and I can't recall if 71's did. By 72 the wiring was all together different. I run double reds on the Rear (Omitted the back up light and My flashers are rather fast. I wonder how they managed to slow down the Flashers running 2 extra Bulbs per side - LOL

my 73 side markers; front amber and flash and rear, red and no flash. 73 first year for air on z 28. power windows introduced late in 73

the fan on constant run(low speed) and all hvac systems off with the key in the on position was part of some constant ventilation system the gm put on all cars past 70 to keep the cockpit ventilated while idling and not moving to prevent asphyxiation from the exhaust

Huh - I never really paid attention to whether 71,72 and 73 Side Markers Flashed but can't recall them if they did. I would imagine if they were set up for flashing there would either have to be 2 wires to the location for a dual filament bulb or each side circuit would have to be interrupted by the Flasher Module which I doubt could be done unless a special flasher was used.

Interesting - Think I'll POST something like "WHO has 71 to 73 Camaro's with Flashing Side Markers" at NastyZ28 Site - LOL

I just might use a Volvo Flasher Unit in my 70Z and wire my Side Markers to Flash - That should create some interest :o))

Interesting answers. I knew that '70 did NOT have flashing sidemarkers, and that 71, 72, and 73 did.

However, I cannot find any source that clarifies whether only the front sidemarkers are supposed to flash (mine do now) or if the rear are supposed to, as well.

The wiring is interesting, as the flasher mechanism alternates between positive and negative to a single-filament 194 bulb in the sidemarkers and is tied in to the front turn signals so they flash alternately instead of at the same time. Not a real simple circuit to understand.

I do not believe my rear sidemarkers were ever intended to flash, and indeed can find no reason or benefit for them to. The front sidemarkers flashing provide needed information to others at, say, a 4-way stop sign: The folks to your left and right may not be able to see the front turn signals, but they can see the side markers up front and need to know what you intend to do.

Drivers behind you can easily see the rear turn signals, making rear flashing sidemarkers unnecessary. That's my reasoning, anyway, for what it's worth...