autometer tach wiring question...
12-02-2007, 04:58 PM
#1
2nd Gear Member
Thread Starter
Join Date: Aug 2007
Location:
Posts: 351
autometer tach wiring question...
I wired up my tachometer and got it working. Green to msd box. White to dash light fuse. Red to ignition fuse of some sort. and ground to ground.
Tachometer works until i put the dash lights on, then the tach stops working and the the tach doesnt light up. Tach is like new and i doubt the light in the tach is bad, but i tried just finding any hot fuse and getting power to light it up and i couldn't. If i shut the dash lights off, the tach will go back to working. Any idea whats going on?
Tachometer works until i put the dash lights on, then the tach stops working and the the tach doesnt light up. Tach is like new and i doubt the light in the tach is bad, but i tried just finding any hot fuse and getting power to light it up and i couldn't. If i shut the dash lights off, the tach will go back to working. Any idea whats going on?
12-02-2007, 05:37 PM
#3
2nd Gear Member
Thread Starter
Join Date: Aug 2007
Location:
Posts: 351
RE: autometer tach wiring question...
idk i followed the directions i got with the tach.
There are4 wires,
1)Ignition Switched power wire(red)
2) Ground (black)
3) Switched dash lighting(white)
4) and Tach Terminal to msd and or coil (green)
There are4 wires,
1)Ignition Switched power wire(red)
2) Ground (black)
3) Switched dash lighting(white)
4) and Tach Terminal to msd and or coil (green)
12-02-2007, 05:56 PM
#4
2nd Gear Member
Join Date: Nov 2007
Location: New Mexico
Posts: 451
RE: autometer tach wiring question...
ok
1)Ignition Switched power wire(red) --- splice this with something such as a cigarette lighter or something else thats only on when the car is.
2) Ground (black) -- duh
3) Switched dash lighting(white) -- headlight switch.
4) and Tach Terminal to msd and or coil (green) -- negative on coil.
1)Ignition Switched power wire(red) --- splice this with something such as a cigarette lighter or something else thats only on when the car is.
2) Ground (black) -- duh
3) Switched dash lighting(white) -- headlight switch.
4) and Tach Terminal to msd and or coil (green) -- negative on coil.
12-02-2007, 06:31 PM
#9
4th Gear Member
Join Date: Oct 2006
Location: Kentucky
Posts: 1,460
RE: autometer tach wiring question...
ORIGINAL: PRO50SC
Do the other dash lights still work when the tach goes out? Sounds like the white wire is connected to the wrong wire.
Do the other dash lights still work when the tach goes out? Sounds like the white wire is connected to the wrong wire.
12-02-2007, 08:09 PM
#10
3rd Gear Member
Join Date: Oct 2006
Location:
Posts: 510
RE: autometer tach wiring question...
Only connect the green wire to the MSD box!
If you connect itto the coil it will damage the tach.
It sounds like you may have a ground problem. With the lights off it may be back feeding through that circuit to get ground. Check your ground is good.
Disconnect the light/white wire and start the car and connect a test light between the white wire and a known good ground. If the light lights up or the tach stops workingyou have a bad ground
If it's ok the tach is bad.
If you connect itto the coil it will damage the tach.
It sounds like you may have a ground problem. With the lights off it may be back feeding through that circuit to get ground. Check your ground is good.
Disconnect the light/white wire and start the car and connect a test light between the white wire and a known good ground. If the light lights up or the tach stops workingyou have a bad ground
If it's ok the tach is bad.
