Author Topic: headlight wiring  (Read 10886 times)

Offline bigchevyc30

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headlight wiring
« on: April 25, 2011, 07:46:13 PM »
well found out im not getting power to my switch can anyone tell me what color or have a diagram of what the wires are so i can have a power wire ran to the switch. my dad had me cut a red wire and hook it straight to the battery with a fusible link that has a 20amp fuse. and i turn the lights on only the headlights come on can you tell me what im doing wrong.
1980 c-30 dually R.I.P
1989 R2500 Sub 350/sm465
1984 k10 sub 6.2/700r4

Offline beastie_3

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Re: headlight wiring
« Reply #1 on: April 25, 2011, 08:27:11 PM »
there is a diagram in the tech section

Offline bigchevyc30

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Re: headlight wiring
« Reply #2 on: April 25, 2011, 08:53:59 PM »
im sorry but idk how to read that i found it but nothing that even looked like my headlight switch plugin
1980 c-30 dually R.I.P
1989 R2500 Sub 350/sm465
1984 k10 sub 6.2/700r4

Offline beastie_3

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Re: headlight wiring
« Reply #3 on: April 26, 2011, 12:20:53 AM »
learn to read the schematic. it isnt that hard. find the device in the diagram, follow each wire and see where it goes. the headlights are a constant hot. that red wire is correct, so if your headlights still dont work, first check your fuses. then check to see if each headlight is grounded. check to see if headlights are not burnt out. check to see if any other lights dont work. do your taillights work? do your dome lights work?

Offline bigchevyc30

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Re: headlight wiring
« Reply #4 on: April 26, 2011, 02:44:27 AM »
the headlights work its the problem that the running lights arent wanting to work. only the headlights come on not anything else the tail lights are light up not are my marker or lights on top the cab
1980 c-30 dually R.I.P
1989 R2500 Sub 350/sm465
1984 k10 sub 6.2/700r4

Offline beastie_3

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Re: headlight wiring
« Reply #5 on: April 26, 2011, 12:11:56 PM »
i cant read your sentences. "only the headlights come on not anything else the tail lights are light up not are my marker or lights on top the cab" what??

Offline ccz145a

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Re: headlight wiring
« Reply #6 on: April 26, 2011, 12:26:35 PM »
on the 73-76 cab interior diagram, it's in the lower center - called LIGHT SWITCH
on the 77-80 cab interior diagram, it's in the lower right - called LIGHT SW
on the 81-87 cab interior diagram pg.2, it's in the lower center - called LIGHT SWITCH
1975 C10 Silverado LWB, 454CID, TH400, 10bolt 3.42
11MPG Downhill w/tailwind (but there ain't no hills here)

Offline bigchevyc30

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Re: headlight wiring
« Reply #7 on: April 26, 2011, 12:53:04 PM »
im sorry i was saying none of my lights the brakes nor the marker lights come on when i turn them on. i ofund out im not getting power out of the switch for the parking lights. what could be going on for that since i know i have power going in the switch
1980 c-30 dually R.I.P
1989 R2500 Sub 350/sm465
1984 k10 sub 6.2/700r4

Offline beastie_3

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Re: headlight wiring
« Reply #8 on: April 26, 2011, 01:13:32 PM »
if you tested the wires coming out of the switch, the switch is probably bad. they arent that expensive. $20 or less. rockauto.com

Offline bigchevyc30

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Re: headlight wiring
« Reply #9 on: April 26, 2011, 01:20:06 PM »
bad thing is i just got the switch bought it yesterday at autozone
1980 c-30 dually R.I.P
1989 R2500 Sub 350/sm465
1984 k10 sub 6.2/700r4

Offline beastie_3

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Re: headlight wiring
« Reply #10 on: April 26, 2011, 01:27:35 PM »
when the switch is turned on, did you test each wire at the back?

Offline bigchevyc30

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Re: headlight wiring
« Reply #11 on: April 26, 2011, 01:33:33 PM »
yeah only a yellow wire has power going out of the box by what i look at for autozone the parking losts run off a brown wire adn would i be able to hook that wire up to the battery and have a switch and fuse to run it so far this truck is so jimmy rigged as the ignition switch is out and it has a new 366 which when we bought it had a 366 jimmyrigged in and they did a bad job. since im not good with my vehicular mechanic abilities as im only 18 and have learned everything on my truck from just replacing whats went out
1980 c-30 dually R.I.P
1989 R2500 Sub 350/sm465
1984 k10 sub 6.2/700r4

Offline topp

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Re: headlight wiring
« Reply #12 on: April 26, 2011, 01:49:06 PM »
yeah only a yellow wire has power going out of the box by what i look at for autozone the parking losts run off a brown wire adn would i be able to hook that wire up to the battery and have a switch and fuse to run it so far this truck is so jimmy rigged as the ignition switch is out and it has a new 366 which when we bought it had a 366 jimmyrigged in and they did a bad job. since im not good with my vehicular mechanic abilities as im only 18 and have learned everything on my truck from just replacing whats went out

Huh?  Punctuation would help.....


Replace the headlight switch is what is recomended...  Don't hack the harness any more.
'90 Suburban TBI 350

Offline bigchevyc30

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Re: headlight wiring
« Reply #13 on: April 26, 2011, 01:51:58 PM »
i have replaced the switch and its still only working headlights its not lighting up my rear brake lights or my marker lights on the side or top of the truck. eventually when i get a different vehicle im wanting to do a frame off restoration as i see none of these trucks being restored around here.
1980 c-30 dually R.I.P
1989 R2500 Sub 350/sm465
1984 k10 sub 6.2/700r4

Offline bigchevyc30

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Re: headlight wiring
« Reply #14 on: April 26, 2011, 02:18:16 PM »
if this can help i have a few pictures of the wires at the switch



1980 c-30 dually R.I.P
1989 R2500 Sub 350/sm465
1984 k10 sub 6.2/700r4