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1970 challenger wiring #3174789 09/12/23 07:41 PM 09/12/23 07:41 PM
Joined: Jan 2004 Posts: 291 O otter440 OP enthusiast
otter440 OP enthusiast O Joined: Jan 2004 Posts: 291	i am doing 1970 challenger went with all new wiring in the car i have pretty much evrything working but the dash lights and headlamps. i have tried different h/l switches. dash dimmer switch, and floor dimmer switch. for some reason i have no power to the orange wires in the dash and no headlamps. the marker lights,taillights and parklamps all work fuse is good. I am baffled any suggestions thanks

Re: 1970 challenger wiring [Re: otter440] #3174795 09/12/23 07:55 PM 09/12/23 07:55 PM
Joined: Jan 2003 Posts: 32,928 Grand Prairie,Texas stumpy I Win
stumpy I Win Joined: Jan 2003 Posts: 32,928 Grand Prairie,Texas	Are your grounds all good? You Should have power to one terminal on the high low floor switch with the headlights on. with the HL switch plugged in but not installed you should be able to see which terminals supply 12v out. Dash lights have their own fuse fed by the dimmer.

Re: 1970 challenger wiring [Re: stumpy] #3174802 09/12/23 08:11 PM 09/12/23 08:11 PM
Joined: Jan 2004 Posts: 291 O otter440 OP enthusiast
otter440 OP enthusiast O Joined: Jan 2004 Posts: 291	my grounds are good. i have no power to the fuse for the dash lights

Re: 1970 challenger wiring [Re: otter440] #3174833 09/12/23 10:07 PM 09/12/23 10:07 PM
Joined: Jan 2003 Posts: 15,338 Omaha Ne T TJP I Live Here
TJP I Live Here T Joined: Jan 2003 Posts: 15,338 Omaha Ne	Originally Posted by otter440 my grounds are good. i have no power to the fuse for the dash lights have you checked the thumbwheel dimmer for the dash lights. If at either extreme it could shut the power off www.tandmautomotive-omaha.com

Re: 1970 challenger wiring [Re: TJP] #3174879 09/13/23 08:52 AM 09/13/23 08:52 AM
Joined: Apr 2021 Posts: 143 Canada E EW1BH27 member
EW1BH27 member E Joined: Apr 2021 Posts: 143 Canada	Just to clarify, you have no power to the circled orange connector?

Re: 1970 challenger wiring [Re: EW1BH27] #3174884 09/13/23 09:12 AM 09/13/23 09:12 AM
Joined: Jan 2004 Posts: 291 O otter440 OP enthusiast
otter440 OP enthusiast O Joined: Jan 2004 Posts: 291	That is correct

Re: 1970 challenger wiring [Re: otter440] #3174889 09/13/23 09:39 AM 09/13/23 09:39 AM
Joined: Jan 2003 Posts: 10,711 North Dakota 6PakBee I Live Here
6PakBee I Live Here Joined: Jan 2003 Posts: 10,711 North Dakota	I don't have a '70 available but looking at the wiring diagram for a '71 it seems straightforward. Black wire from the headlight switch to the dimmer switch. Tan wire from the dimmer switch to the fuse block. Fuse. Orange wires to dash lights. Follow the trail. Good luck. "We live in a time when intelligent people are being silenced so that stupid people won't be offended".

Re: 1970 challenger wiring [Re: otter440] #3174912 09/13/23 12:23 PM 09/13/23 12:23 PM
Joined: Jan 2003 Posts: 15,338 Omaha Ne T TJP I Live Here
TJP I Live Here T Joined: Jan 2003 Posts: 15,338 Omaha Ne	Originally Posted by otter440 i am doing 1970 challenger went with all new wiring in the car i have pretty much evrything working but the dash lights and headlamps. i have tried different h/l switches. dash dimmer switch, and floor dimmer switch. for some reason i have no power to the orange wires in the dash and no headlamps. the marker lights,taillights and parklamps all work fuse is good. I am baffled any suggestions thanks While the diagram that EW1BH27 posted is helpful, you really need the schematic for the entire car or at least those showing the dashboard/dimmer switch forward. You can try to get by with out it but it really saves time> the entire service manual is available here for FREE FREE Manuals I print out the sections needed, tape them together if necessary, and strongly encourage a box of assorted colored pencils to trace the wires. I would go after each circuit separately Starting with the headlights. It may take a little bit to familiarize yourself with the way the schematic(s) were done but it is pretty easy. Optionally buy one of the laminated full size color coded schematics. 1. Do you have power at the center terminal of the dimmer switch? that power comes from the headlight switch. No power? check the other two terminals just for giggles. I've seen several mis-wires on "NEW" harnesses as well as bad crimps. a). Check the headlight switch to verify power is present at the terminal that feeds the H/L's when they are on. Be aware some cars use separate 12v feeds for the H/L's and other lights. the largest wire is normally headlights. b) If you don't have power at the output to the dimmer, using a wiring diagram for YOUR car work your way back to find the source of that power. If there are connectors along the way, checking each connector and the in and out terminals. keep us posted www.tandmautomotive-omaha.com

Re: 1970 challenger wiring [Re: TJP] #3174931 09/13/23 01:25 PM 09/13/23 01:25 PM
Joined: Apr 2021 Posts: 143 Canada E EW1BH27 member
EW1BH27 member E Joined: Apr 2021 Posts: 143 Canada	Here's the other 1/2 of my posted schematic

Re: 1970 challenger wiring [Re: EW1BH27] #3174949 09/13/23 02:39 PM 09/13/23 02:39 PM
Joined: Apr 2003 Posts: 164 Colorado S spk2go member
spk2go member S Joined: Apr 2003 Posts: 164 Colorado	Orange wire is powered through the ignition switch, may want to try jumping the wires there.

Re: 1970 challenger wiring [Re: spk2go] #3175051 09/13/23 09:43 PM 09/13/23 09:43 PM
Joined: Jan 2003 Posts: 15,338 Omaha Ne T TJP I Live Here
TJP I Live Here T Joined: Jan 2003 Posts: 15,338 Omaha Ne	Originally Posted by spk2go Orange wire is powered through the ignition switch, may want to try jumping the wires there. That would have nothing to do with the power for the head or dash lights. it may be an indicator lamp for the ignition switch Last edited by TJP; 09/13/23 09:48 PM. www.tandmautomotive-omaha.com

Re: 1970 challenger wiring [Re: TJP] #3185877 10/23/23 11:03 AM 10/23/23 11:03 AM
Joined: Oct 2023 Posts: 3 NY firebreather member
firebreather member Joined: Oct 2023 Posts: 3 NY	Originally Posted by TJP Originally Posted by otter440 i am doing 1970 challenger went with all new wiring in the car i have pretty much evrything working but the dash lights and headlamps. i have tried different h/l switches. dash dimmer switch, and floor dimmer switch. for some reason i have no power to the orange wires in the dash and no headlamps. the marker lights,taillights and parklamps all work fuse is good. I am baffled any suggestions thanks While the diagram that EW1BH27 posted is helpful, you really need the schematic for the entire car or at least those showing the dashboard/dimmer switch forward. You can try to get by with out it but it really saves time> the entire service manual is available here for FREE FREE Manuals I print out the sections needed, tape them together if necessary, and strongly encourage a box of assorted colored pencils to trace the wires. I would go after each circuit separately Starting with the headlights. It may take a little bit to familiarize yourself with the way the schematic(s) were done but it is pretty easy. Optionally buy one of the laminated full size color coded schematics. 1. Do you have power at the center terminal of the dimmer switch? that power comes from the headlight switch. No power? check the other two terminals just for giggles. I've seen several mis-wires on "NEW" harnesses as well as bad crimps. a). Check the headlight switch to verify power is present at the terminal that feeds the H/L's when they are on. Be aware some cars use separate 12v feeds for the H/L's and other lights. the largest wire is normally headlights. b) If you don't have power at the output to the dimmer, using a wiring diagram for YOUR car work your way back to find the source of that power. If there are connectors along the way, checking each connector and the in and out terminals. keep us posted Thank you, I will download these manuals. I have no power to either the headlights or the marker lights, I'm trying to figure it out. Last edited by firebreather; 10/23/23 11:04 AM.

Re: 1970 challenger wiring [Re: firebreather] #3185886 10/23/23 11:35 AM 10/23/23 11:35 AM
Joined: Apr 2003 Posts: 12,234 Looking for a way out of Middl... IMGTX I Live Here
IMGTX I Live Here Joined: Apr 2003 Posts: 12,234 Looking for a way out of Middl...	Originally Posted by firebreather Thank you, I will download these manuals. I have no power to either the headlights or the marker lights, I'm trying to figure it out. When Checking for Voltage at the plug do not use a VOM connected to both sides of the plug. Run one lead of the VOM to the battery. You could have a bad ground which looks like no voltage at the plug, very common. If you ground the VOM at the battery when you check for Positive voltage at the plug you will get an accurate reading as to whether or not there is Positive voltage at the plug. I always confirm my ground to my test gauge/light is good before I test for voltage. Hope it helps. Last edited by IMGTX; 10/23/23 11:36 AM.

Re: 1970 challenger wiring [Re: 6PakBee] #3185930 10/23/23 01:39 PM 10/23/23 01:39 PM
Joined: Aug 2003 Posts: 43,152 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,152 Bend,OR USA	I think that Dodge change some of the wring harnesses on both E bodies from 1970 to 1971 and later, maybe not Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

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