Two Electrical Questions

[ecna]

First...

Low beams work fine... when you switch to high-beam, all headlights are out. I've changed dimmer switch and headlight switch... any ideas?

Second...

No blower motor on high... I've changed the high-blower relay... any ideas?

Thanks in advance.

Eric

 

[oddfire6]

four bad head lights or bad ground ???

 

[SFITurbo]

Check the ground behind the lights that goes to the fender.

 

[salvageV6]

Light green wire is cooked right at the connector that plugs into the dimmer switch.

Or the light green wire which should have +12 out of the dimmer switch when on HI beams is not getting out to the headlights via the C100 bulkhead connector under the wiper motor.

Doe the high beam indicator go on when the hi beam switch is clicked?

 

[ecna]

I forgot... all four headlights are new.

Yes... the indicator does come on.

I'll check that wire.

Thanks,
Eric

 

[conn84gn]

Did you use the electricial grease on the plugs?
Many times they are corroded.
I don't think all four would give you a problem

 

[salvageV6]

The high beam indicator is wired before the bulkhead connector and after the dimmer switch. Therefore the C100 bulkhead connector or wiring out in the harness past that point is the problem.

It's pin D2 on that connector and a light green wire, it is also spliced in the harness at S270 in the front lights wiring harness behind the Left headlight, it's near the horn wiring but buried inside the harness on the motor not the headlight side of the radiator, that splice could be a problem as well.

I'd use a small block of wood on the C100 bulkhead connector and a small hammer and give it a few raps to see if anything happens to pass the +12 out to the high beams.

Or else remove the wiper motor and test that point after removing the harness connector and get to pin D2.

Going after the splice inside the harness would require unwrapping it to check the crimp point. Following the right side high beam wiring over to the harness may help to locate that splice as well.

 

[ecna]

SalvageV6,

Wow... great post!

I'll get working on it.

Thanks,
Eric

 

[ecna]

Thanks to SalvageV6, I focused my attention ahead of the firewall. I ended up finding a light green wire with a female spade connector sticking out of the harness tucked behind the cruise control "thing" on the fender well. I opened up the harness a bit and found the light green wire going forward with a six inch extension of wire spliced to it also with a female spade connector on it. Obviously they didn't fit together... I took out the extra wire and spliced the greens together and everything works perfectly. Any ideas what somebody would have put inline to the high-beams (and of course later removed to drive me crazy)?

Anyway... thanks again... any ideas on the blower motor?

Eric

 

[95ImpalaSS]

Blower motor

There is a resistor right next to the blower motor under the hood that might be bad. but normaly when they go bad the motor wont work on the lower speeds. I would first check power out of your blower motor switch and then follow it to the resistor hope that helps

 

[salvageV6]

Quite possibly at one time it may have had some sort of upgraded high beams or else some sort of driving lights attached to that wire with a relay and altternate power source for them, just guessing at why someone would tap into them there.

Do a search on the blower motor question, or just follow the red wire off the high speed blower motor relay over to the antenna area on the passenger side fenderwell and find a connector in there that the fat red wire should pass +12 through at all times since it's directly off the fusible link.

That hot wire is the high speed feed via that metal relay that provides +12 for high speed fan operation.

Assuming the new relay works and "clicks" with a key on test and blower motor switch on HI with the vents on.

Usually it's that red wire at the antenna however.