Tom Slick 88
Thread Starter
Heel & Toe
Joined: Sep 2013
Posts: 24
Likes: 0
Tom Slick 88
Headlights will not go up. Lights work. Hooked up motors direct to battery and they go up and down no noise or problem. Power to relay and power coming out from 3 terminals on relay terminal D has no power. 88 corvette. Any ideas. My first vet and I can't drive it at night.
Melting Slicks
Joined: Aug 1999
Posts: 2,240
Likes: 41
From: Baltimore, MD USA
Headlights will not go up. Lights work. Hooked up motors direct to battery and they go up and down no noise or problem. Power to relay and power coming out from 3 terminals on relay terminal D has no power. 88 corvette. Any ideas. My first vet and I can't drive it at night.
two fusible links. Both Red wires.
Connector C1 are the four wires for the motors.
Connector C2 Pin A Yellow wire is Hot when headlight switch is in Head.
(Headlight buckets should open).
Connector C2 Pin C White wire is Hot when the headlight switch is Off.
(Headlight buckets should close).
Connector C2 Pin D is ground.
Drifting
Joined: Dec 2011
Posts: 1,439
Likes: 23
From: mesa az
If I was familiar with this method I would have suggested it ! I am one of those guys who takes his money pit to a mechanic. I don't own any tools except a cheap set of small sockets and stars. The guy I go to is at his house and works a regular job. He has thousands and thousands of dollars invested in tools. The majority of guys on here work on their own car. It is probably a huge reason why they can afford to drive their car. I am talking about guys who tear the motor apart and put AFR heads on. If I didn't have to pay a mechanic I would have a 400HP engine in my car. Anyway I wasn't offended at all Loopidoo. My driver side headlight only goes up halfway. I have to get out and when I pull the lever quickly help it go all the way up. Always something. My girlfriend starts on her GET RID OF THIS MONEY PIT speech.
Thread Starter
Heel & Toe
Joined: Sep 2013
Posts: 24
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head lights don't go up
Thank you very much for diagram and explanation. My guess now is there is no ground to the relay. All the wires leading to the head lights are hot all the time. Also when I removed the connector and tried to use the D terminal for a ground the test light would not work. So either the ground to the relay is bad or the relay itself is bad. You know the relay that costs about $140.
Thanks for the toggle switch and hand crank ideas also but my goal is to get everything working like the factory sent it out.
Next is the power release for rear glass.
Thanks for the toggle switch and hand crank ideas also but my goal is to get everything working like the factory sent it out.
Next is the power release for rear glass.
Melting Slicks
Joined: Aug 1999
Posts: 2,240
Likes: 41
From: Baltimore, MD USA
Pin D connector C2 Black wire at the headlight control module
is splced at S120 to a bunch of other ground wires.
All of the following items are grounded by G115.
LH, RH horns
LH, RH headlight bulbs
LH, RH cornering bulbs
LH, RH parking and turn signal bulbs
LH, RH underhood courtesy lamps
Headlight control module
Cruise control servo
If all of the above work ground point G115 is good.
Take a piece of wire attach one end to the negative battery cable.
splice the other end to Pin D Black wire and see if the headlight
control module works.
is splced at S120 to a bunch of other ground wires.
All of the following items are grounded by G115.
LH, RH horns
LH, RH headlight bulbs
LH, RH cornering bulbs
LH, RH parking and turn signal bulbs
LH, RH underhood courtesy lamps
Headlight control module
Cruise control servo
If all of the above work ground point G115 is good.
Take a piece of wire attach one end to the negative battery cable.
splice the other end to Pin D Black wire and see if the headlight
control module works.
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Thread Starter
Heel & Toe
Joined: Sep 2013
Posts: 24
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Tom Slick 88
Hooked on Vettes
Tested headlight relay good ground at d power at both red wires and power to yellow and white when switch is turned on and off no power going out of relay. Must be bad relay. Thanks again. Anyone know of good supplier for headlight relay.
Next problem, power release for rear glass does not work.
Tested headlight relay good ground at d power at both red wires and power to yellow and white when switch is turned on and off no power going out of relay. Must be bad relay. Thanks again. Anyone know of good supplier for headlight relay.
Next problem, power release for rear glass does not work.
Melting Slicks
Joined: Aug 1999
Posts: 2,240
Likes: 41
From: Baltimore, MD USA
This appears to be the cheapest used one on E-bay. They claim it works. $59.00 shipped.
Link listed below.
I think GM discontinued the part but it is available from other sources such
as Corvette Central. The GM part number is 16510537 used on 88-96 Corvettes.
New module goes for $150.00.
As for the rear hatch solenoid problem if you don't hear the solenoid activate
but hear a faint click from the relay you can test the solenoid at the connector
plug. The picture in the link shows the cable that is tucked in back of the interior
rear carpet.
You pull on the cable to manually open the rear hatch. To gain access to the relay and solenoid you need
to remove the rear hatch center trim panel.
http://forums.corvetteforum.com/1578985114-post4.html
This thread shows the repair of the ground for the solenoid if you have 12 volts
at the solenoid but it doesn't activate or it sounds weak.
http://forums.corvetteforum.com/c4-t...id-repair.html
This is the E-bay link
http://www.ebay.com/itm/Corvette-headlight-module-relay-88-89-90-91-92-93-94-95-96-/390668295976?hash=item5af5a51f28&vxp=mtr
Link listed below.
I think GM discontinued the part but it is available from other sources such
as Corvette Central. The GM part number is 16510537 used on 88-96 Corvettes.
New module goes for $150.00.
As for the rear hatch solenoid problem if you don't hear the solenoid activate
but hear a faint click from the relay you can test the solenoid at the connector
plug. The picture in the link shows the cable that is tucked in back of the interior
rear carpet.
You pull on the cable to manually open the rear hatch. To gain access to the relay and solenoid you need
to remove the rear hatch center trim panel.
http://forums.corvetteforum.com/1578985114-post4.html
This thread shows the repair of the ground for the solenoid if you have 12 volts
at the solenoid but it doesn't activate or it sounds weak.
http://forums.corvetteforum.com/c4-t...id-repair.html
This is the E-bay link
http://www.ebay.com/itm/Corvette-headlight-module-relay-88-89-90-91-92-93-94-95-96-/390668295976?hash=item5af5a51f28&vxp=mtr
Last edited by Hooked on Vettes; Oct 5, 2013 at 11:56 PM.
Thread Starter
Heel & Toe
Joined: Sep 2013
Posts: 24
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found used relay $50 will put it in this weekend and post response. Also performed repair to rear glass release posted by vetterobert will post results next weekend. Thanks to one and all!!! this is a great forum.
tom slick 88
tom slick 88
Thread Starter
Heel & Toe
Joined: Sep 2013
Posts: 24
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Success
Thanks for the help. Head lights now work and trunk release also. 
Took it out for a cruise and the car is running strong. Two new items brake pedal is very hard and AC and blower motor are on high every time I start the car.
Tom Slick 88
Took it out for a cruise and the car is running strong. Two new items brake pedal is very hard and AC and blower motor are on high every time I start the car.
Tom Slick 88
Thread Starter
Heel & Toe
Joined: Sep 2013
Posts: 24
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body work
Just wanted to post this and get some feed back. I have not done body work in a long time but this looks like it will work. If we have any real body men out there out would be great to hear from you.
http://www.corvette-restoration.com/...Tech_Paper.pdf
Thanks
Tom Slick 88
http://www.corvette-restoration.com/...Tech_Paper.pdf
Thanks
Tom Slick 88
Safety Car
Joined: Nov 2008
Posts: 4,328
Likes: 15
From: Jacksonville FL
Just wanted to post this and get some feed back. I have not done body work in a long time but this looks like it will work. If we have any real body men out there out would be great to hear from you.
http://www.corvette-restoration.com/...Tech_Paper.pdf
Thanks
Tom Slick 88
http://www.corvette-restoration.com/...Tech_Paper.pdf
Thanks
Tom Slick 88
Melting Slicks
Joined: Aug 1999
Posts: 2,240
Likes: 41
From: Baltimore, MD USA
They are made of plastic and hair line cracks cause them to leak.
If you unplug the vacuum hose going to it and use a hand held
vacuum pump, vacuum should hold. Press the brake pedal should
release the vacuum. At the input where the vacuum hose there is also a one way check valve.
If it is a crack, some people use epoxy to repair the crack or you can replace the booster with a aftermarket one that has a metal housing.
Which AC system do you have?
C60 manual AC uses resistors and a relay to change voltage to the blower motor. C68 auto climate control uses a blower motor control
module.
Can you manually turn the blower motor off and can you manually
control the blower motor speed?
Here's a a thread with a picture of a cracked booster. Normally
the cracks are hair line in size.
http://forums.corvetteforum.com/c4-t...ing-cause.html
Thread Starter
Heel & Toe
Joined: Sep 2013
Posts: 24
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Will check booster and check valve ASAP. The AC I can set fan speed. I guess the auto climate I can set temp and it will adjust automatically when car starts. So I have to figure out how to set temp.
Melting Slicks
Joined: Aug 1999
Posts: 2,240
Likes: 41
From: Baltimore, MD USA
