Reverse Light Question....help?
Thread Starter
Drifting
Joined: Nov 2004
Posts: 1,627
Likes: 293
2020 C3 of the Year Finalist - Modified
Reverse Light Question....help?
Here's my problem:
My reverse light switch by the gear shifter works just fine. I'm getting power to & from there like it should. I'm reading 12V leaving the switch on the LT GRN wire (when in reverse and ign on). I'm not reading 12V at the rear tail light harness connection where bundle of wires comes out of the fuse box. I pulled the fuse and put a jumper in place and still nothing at the LT GRN wire at rtl harness.
Does this LT GRN wire travel anywhere else inbetween (besides the fusebox)the rev. light switch and the rear tail light harness connection? Fuse box layout says the turn signals are on that same fuse, could this have anything to do with it? (I'm not sure how it could though)
I bypassed the fuse box and everything works just fine. (went straight from lt grn wire at switch to the lt grn wire on fuse box side of rtl harness) I'd rather fix this issue instead of "rigging" it up like this!
Any help is greatly appreciated!!!!
Ryan
My reverse light switch by the gear shifter works just fine. I'm getting power to & from there like it should. I'm reading 12V leaving the switch on the LT GRN wire (when in reverse and ign on). I'm not reading 12V at the rear tail light harness connection where bundle of wires comes out of the fuse box. I pulled the fuse and put a jumper in place and still nothing at the LT GRN wire at rtl harness.
Does this LT GRN wire travel anywhere else inbetween (besides the fusebox)the rev. light switch and the rear tail light harness connection? Fuse box layout says the turn signals are on that same fuse, could this have anything to do with it? (I'm not sure how it could though)
I bypassed the fuse box and everything works just fine. (went straight from lt grn wire at switch to the lt grn wire on fuse box side of rtl harness) I'd rather fix this issue instead of "rigging" it up like this!
Any help is greatly appreciated!!!!
Ryan
Thread Starter
Drifting
Joined: Nov 2004
Posts: 1,627
Likes: 293
2020 C3 of the Year Finalist - Modified
Thanks again for the quick response! You've helped a lot in the past week or so.
I do have an auto th 350 transmission.
I followed the lt grn wire from the switch until it went into the large loom and that lead back to the fuse box. Followed from the rear tail light harness connection into large loom that lead back to the fuse box. I would assume the lt grn wire just passes through the box then without it being fused.
There has to be another connection point in that circuit.....well that or the previous owner cut the wire somewhere inbetween.
I tried searching but didn't come up with much info on this issue.maybe someone else can chime in if there perhaps is some kinda jumper in that circuit????
I do have an auto th 350 transmission.
I followed the lt grn wire from the switch until it went into the large loom and that lead back to the fuse box. Followed from the rear tail light harness connection into large loom that lead back to the fuse box. I would assume the lt grn wire just passes through the box then without it being fused.
There has to be another connection point in that circuit.....well that or the previous owner cut the wire somewhere inbetween.
I tried searching but didn't come up with much info on this issue.maybe someone else can chime in if there perhaps is some kinda jumper in that circuit????
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
Here is a link to a diagram from a 78 and its the same as your 79 except the 139 conn is referred to as 175 on the 79.
Unless there are 2 wiring harnesses , 1 for 4sp and 1 for auto I'm guessing there is another connector so a 4sp jumper harness can get into the circuit.
The 4sp wiring connector pink and green is usually just below where the throttle cable comes through the firewall on the engine side,check there and see if you can spot something.
http://www.corvetteforum.net/c3/tune.../index11.shtml
Unless there are 2 wiring harnesses , 1 for 4sp and 1 for auto I'm guessing there is another connector so a 4sp jumper harness can get into the circuit.
The 4sp wiring connector pink and green is usually just below where the throttle cable comes through the firewall on the engine side,check there and see if you can spot something.
http://www.corvetteforum.net/c3/tune.../index11.shtml
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,112
From: Crossville TN
Disconnect that wire at the shifter, then use an ohmeter to check continuity of that wire from the connection at the rear of the car to the connection at the shifter. You will then know if it is an 'open' circuit or not. If it is, you can then use a needle to puncture the insulation of that wire at some spots along that path until you find the [physical] area of the break in the wire. That should help you find the problem and resolve it.
Are you certain that the problem is with that wire and not with the ground connection at the rear of the car?
Are you certain that the problem is with that wire and not with the ground connection at the rear of the car?
Thread Starter
Drifting
Joined: Nov 2004
Posts: 1,627
Likes: 293
2020 C3 of the Year Finalist - Modified
Roger:
Ill have to check for that 4 speed connection later today like you mentioned.
7T1vette:
Yes ground is certainly not a problem....my taillights/running work just fine....the problem is somewhere between the switch and where the connection at the rear tail light harness.
Ill have to check for that 4 speed connection later today like you mentioned.
7T1vette:
Yes ground is certainly not a problem....my taillights/running work just fine....the problem is somewhere between the switch and where the connection at the rear tail light harness.
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
I just wanted to confirm we were all on the same page and that you weren't talking about the harness at the "rear" of the car.
Hopefully someone with their dash and console out can chime in as to if there is a connector that could have come apart or you actually have a broken wire.
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Thread Starter
Drifting
Joined: Nov 2004
Posts: 1,627
Likes: 293
2020 C3 of the Year Finalist - Modified
Yes we are talking about the same connection. I'm testing at that connector where it goes to the rear of the car. (I'm not testing at the rear of the car, I don't even have the rear harness connected right now)
take a look at this picture. Looks like someone has previously ripped the green wires out or spliced into them at one time. Judging by the insulation it looks like it was somehow ripped out. I haven't made a connection yet because I can't find the other end of the lt grn wire. Trying to decide if it's worth my time to make a solder connection right there or just splice into the ltgrn wire at the switch and run a new wire up to the wiring harness leading to the rear of the car. Either way you are right, there is a connection down there for a manuel trans. and that is where the issue was. I guess I can't take much for granted with this car!
take a look at this picture. Looks like someone has previously ripped the green wires out or spliced into them at one time. Judging by the insulation it looks like it was somehow ripped out. I haven't made a connection yet because I can't find the other end of the lt grn wire. Trying to decide if it's worth my time to make a solder connection right there or just splice into the ltgrn wire at the switch and run a new wire up to the wiring harness leading to the rear of the car. Either way you are right, there is a connection down there for a manuel trans. and that is where the issue was. I guess I can't take much for granted with this car!
