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06-25-2004, 07:46 PM
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#1 |
Join Date: Jan 2003
Location: Modesto, CA
Posts: 1,321
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Where is your Tach "Illumination" wire hooked to?
On my truck, I have the Tach's Illumination wire hooked into the headlight switch up in the dash. But everytime I turn on my headlights, my tach goes semi-crazy. It looks like it's idling 500rpm higher, but as soon as I turn OFF the lights, the tach reads fine. Any ideas?
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06-25-2004, 08:05 PM
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#2 |
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You get what you pay for
 
Join Date: Dec 1999
Location: Cherryville, NC
Posts: 4,798
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All my gauges are hooked up to the instrument light circuit. Gray wires.
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Mike 1985 Chevy C-10 |
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06-25-2004, 08:29 PM
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#3 | |
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Join Date: Jan 2003
Location: Modesto, CA
Posts: 1,321
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Quote:
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06-25-2004, 08:31 PM
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#4 |
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Registered User
Join Date: Mar 2003
Location: Walker, LA
Posts: 2,925
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It's in the wiring harness that plugs into the back of the cluster.
__________________
Gary -1986 SWB: lowered 4/6, SOLD!!! -Best 1/4 mile: 14.51 @ 91.01 MPH -2001 Pewter Tahoe, billet grill, Corsa Sport Cat-back, K&N FIPK SOLD!!! -2004 Z-71 Extended cab with a flowmaster, BDS 6.5", 3" BL, 35x12.5x18 Trail Grapplers on Pro-Comp 18x9 wheels |
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06-25-2004, 08:32 PM
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#5 | |
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Join Date: Jan 2003
Location: Modesto, CA
Posts: 1,321
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Quote:
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06-25-2004, 09:01 PM
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#6 |
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LED King
Join Date: Jan 2003
Location: Sacramento, CA
Posts: 2,087
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If you don't have the stock stereo than look for a gray wire by the stereo (It used to have a dash light in it) and run it from that wire. That is what I accidentally soldered a wire to when installing my deck
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Tyler 1985 C10 305 w/ Bowtie OD TH700R4 3.42 LSD 202,000 miles 2006 Ford Focus ZX3 5-speed Stick 2016 Chevy Spark EV Gone: 2002.5 VW GTI 24v VR6 Gone: 2008 VW R32 |
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06-25-2004, 09:38 PM
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#7 |
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Join Date: Jan 2003
Location: Modesto, CA
Posts: 1,321
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Well, as hard as it may sound..I actually found the "Gray" wire first shot.
Hopefully, tonight, the tach won't bounce around when I turn on the headlights.
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07-07-2004, 07:59 PM
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#8 |
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www.loweredd.com
Join Date: Aug 2002
Location: Struble IA
Posts: 808
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My fuse block has a "lmps" (or something like that) socket in it. Plug it in there.
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07-07-2004, 08:19 PM
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#9 |
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driving is in my blood
Join Date: Dec 1999
Location: Mesa AZ
Posts: 5,748
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Tach is hooked up to instrument lights, when they go on so does the tach.
__________________
-78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle. -98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes. -02 Suburban 4x4: leveled front -CBR600F4i, CBR600RR, CBR1000RR, and standup skis DISCLAIMER: I cant spell for the life of me. |
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07-08-2004, 09:54 AM
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#10 |
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Shadetree Mechanic
Join Date: Oct 2002
Location: Youngsville, NC
Posts: 100
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Sounds like you have a bad ground
Appling power to the lights on the tach should have no impact on the tach reading, if it does I think you have a bad ground going to the tach.
There is a special fuse on the fuse block for the instrument lamps that is powered from the light switch, I believe it has a 5 amp fuse, you should be able to connect either to the gray wire as Swervin indicated or to the fuse block. Hope this helps.
__________________
Dave M. (Hacksaw) 86 C10 Scottsdale LWB, 4.3L, Edelbrock 1904, K&N, 700R4, 3.08 Auburn Performance 89 GMC S-15 Extended Cab 4x4, 4.3L, FI 98 K1500 Xcab, 5.7L, 3.43 Gov-Lok |
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