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#1 |
Registered User
Join Date: Nov 2015
Location: Colfax California
Posts: 1,644
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Where to run tach lighting wire
Can I run the backlighting wire on an autometer tach somewhere in the fuse panel? If so, where? It's a 70 c10 thanks guys
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#2 |
Registered User
Join Date: Feb 2014
Location: Los Angeles area :(
Posts: 499
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Re: Where to run tach lighting wire
If you have an auto column, you can tap into the light for the gear indicator. If not, you can tap into the plug for the gauges. If you don't like that, you can test which AUX port on the fuse block is key hot and constant.
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'68 C10 SWB '85 K30 Blazer |
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#3 |
Msgt USAF Ret
![]() ![]() Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,714
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Re: Where to run tach lighting wire
The gear selector light wire is not a light wire it is a fiber optic line from the dash cluster light to the gear indicator. Do not use that.
You can tap into the gauge plug with the two gray wires from the fuse panel. One of them comes from from the fuse panel to bring power to the gauge lights and the other one runs over to the heater panel. it will continue over to the glove box if you have a light in that. If you want the tach light to dim you will have to use the gray wire. If you connect it to the fuse panel key on hot, terminal the tach light will be on anytime the key is on. You could splice it into the brown wire on the headlight switch and it will come on with the lights but it will not dim.
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VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
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#4 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
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I always tap into the grey wire on the cluster. That way it deems when you turn the head light switch. You can plug into the cluster feed beside it is a connection to feed lights.
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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#5 |
Registered User
Join Date: Nov 2015
Location: Colfax California
Posts: 1,644
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Re: Where to run tach lighting wire
I plugged it into that cluster feed, and it lit the tach and gauge cluster for a second when I pulled out the headlight switch (turned on) and then the tach and gauge cluster went out and do not light up anymore
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#6 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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Check the fuse.
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__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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#7 |
Msgt USAF Ret
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Location: Kalamazoo, Michigan
Posts: 8,714
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Re: Where to run tach lighting wire
The PNl Lts fuse is where you should have tapped into, as it fuses the gray wire to the instrument lights. Check it and the cluster feed fuse which feeds the gauges in the cluster.
The instrument lights are powered off of the headlight switch by a green wire which runs to the fuse panel PNL LTS fuse. It runs through the headlight dimmer rheostat and then to the fuse panel.
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VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
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#8 | |
Registered User
Join Date: Feb 2014
Location: Los Angeles area :(
Posts: 499
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Re: Where to run tach lighting wire
Quote:
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'68 C10 SWB '85 K30 Blazer |
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#9 | |
Always on the hunt...
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Location: Portland, OR.
Posts: 5,604
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Re: Where to run tach lighting wire
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#10 | |
Registered User
Join Date: Nov 2015
Location: Colfax California
Posts: 1,644
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Re: Where to run tach lighting wire
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#11 |
Registered User
Join Date: Mar 2014
Location: Lincoln Park, NJ
Posts: 189
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Re: Where to run tach lighting wire
Silly question here, does any know whether the tap between the panel lts and the cluster feed fuse is protected/fed from the cluster feed fuse or the panel lts fuse?
Other way of asking is that tap feed dim-able (panel) or always hot in run/start (cluster)?
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#12 | |
Registered User
Join Date: Mar 2014
Location: Lincoln Park, NJ
Posts: 189
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Re: Where to run tach lighting wire
Quote:
So got out the ole VOM and determined that the open tap between panel lts and cluster feed is tied to the panel lights fuse (and therefore is dimmable).
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