1975 Chevy Vega Fuse Box (extra wires in front)
Posted: Wed Mar 30, 2016 6:15 am
1975 Chevy Vega Hatchback Fuse Box Wiring Question (sbc, 600cfm carb, auto trans, no a/c)
*Added: seems to be a stock sbc, mechanical fuel pump
1. The car ran good.
2. Then I messed with it. I decided to “improve” the weird wiring at the front of the fuse box….
3. Now the sbc (with HEI) runs a little rough -- about 90% good. Maybe its not getting enough current in the ignition circuit? It also backfires a bit out of the exhaust header.
4. In the photo, I tried to remake the wiring as the prior owner had it. Originally, it had a pink wire… hooked into a factory looking White plastic dual connector … hooked up to IGN port. (The white “dual connector” was about ½ the size of the black connector holding the Directional Flasher (?) in the photo. It had the original pink 16g wire going into the IGN port. On the side of the white connector there was an approx. 3" long, fat 10-12g wire, with ½" exposed wire on the end [somewhat corroded green] that went behind the partly dislodged DIR SIG & BACKUP fuse.)
5. If you check the factory wiring diagram for 75 Vega... it shows that the bottom of the DIR SIG & BACKUP fuse is NOT HOT (I don't know why. It is the only fuse with no connection on the bottom.)
6. The factory column ignition switch used to start and shut off the engine fine. Today (Wed) made the red exposed wire (behind dislodged fuse) contact the bottom of the fuse better -- and it runs great. So it starts normally with key ... and runs great ... but key doesn’t shut the engine off.
If I pull the pink and red wire the engine will keep on running. (To shut off engine, have to pull Neg battery terminal and #2 Sensing wire (bottom wire on Delco 3-Wire Alternator.)
(Added 5 days later; [1} on photo is not a Directional or Turn signal flasher; its a mystery cylinder with 3 terminals.......)
Main Questions
1. BEFORE I MESSED WITH THE WIRES… WAS THAT HOW THE FACORY WIRED IT (White dual connector, with a fat 10-12g wire running to the dislodged DIR SIG fuse)???
2. WHY WOULD THE PRIOR OWNER WIRE IT THAT WAY?
3. HOW CAN I FIX IT SO IT IS RELIABLE & WORKS GOOD ???
4. Thanks for your help.
*Added: seems to be a stock sbc, mechanical fuel pump
1. The car ran good.
2. Then I messed with it. I decided to “improve” the weird wiring at the front of the fuse box….
3. Now the sbc (with HEI) runs a little rough -- about 90% good. Maybe its not getting enough current in the ignition circuit? It also backfires a bit out of the exhaust header.
4. In the photo, I tried to remake the wiring as the prior owner had it. Originally, it had a pink wire… hooked into a factory looking White plastic dual connector … hooked up to IGN port. (The white “dual connector” was about ½ the size of the black connector holding the Directional Flasher (?) in the photo. It had the original pink 16g wire going into the IGN port. On the side of the white connector there was an approx. 3" long, fat 10-12g wire, with ½" exposed wire on the end [somewhat corroded green] that went behind the partly dislodged DIR SIG & BACKUP fuse.)
5. If you check the factory wiring diagram for 75 Vega... it shows that the bottom of the DIR SIG & BACKUP fuse is NOT HOT (I don't know why. It is the only fuse with no connection on the bottom.)
6. The factory column ignition switch used to start and shut off the engine fine. Today (Wed) made the red exposed wire (behind dislodged fuse) contact the bottom of the fuse better -- and it runs great. So it starts normally with key ... and runs great ... but key doesn’t shut the engine off.
If I pull the pink and red wire the engine will keep on running. (To shut off engine, have to pull Neg battery terminal and #2 Sensing wire (bottom wire on Delco 3-Wire Alternator.)
(Added 5 days later; [1} on photo is not a Directional or Turn signal flasher; its a mystery cylinder with 3 terminals.......)
Main Questions
1. BEFORE I MESSED WITH THE WIRES… WAS THAT HOW THE FACORY WIRED IT (White dual connector, with a fat 10-12g wire running to the dislodged DIR SIG fuse)???
2. WHY WOULD THE PRIOR OWNER WIRE IT THAT WAY?
3. HOW CAN I FIX IT SO IT IS RELIABLE & WORKS GOOD ???
4. Thanks for your help.