gazellis

I am installing some gauges in my RX-7. Where is the best place to splice to the ignition? Each gauge has a wire to go to the ignition and I am not sure where to splice into it.



Also, can three gauges be connected in series and then the first one int he series be connected to the ignition or do they each have to plice into the ignition seperately? just a thought.



Thanks for any help.

Nemesis

It's just looking for a switched 12v power source. Just run one wire down to your fuse box and splice it into the radio power. You can run all three gauge off of the one power wire (in series).

j9fd3s

on the trailing coil theres a tach output you can use, its the extra wire



mike

Pazuzu

Shouldn't it be in parallel so each is seeing a full 12V? If you wire several guages (or anything lighted thing) in series, they'll all be dim and underpowered.

Nemesis

It's all being run off of the same power source no matter where you are splicing in. You should get 12v no matter how many devices you have connected, it's really a matter of how many amps are being draw.



Apparently the best place to connect the gauges is in the ignition harness. Take out the two screws that hold in the vent below the steering column. There are two seperate two-wire connectors. Look for one that has a white wire and a black wire. They are fairly thick - 10 AWG. The black wire should have 0V when the car is off and have 12V when the ignition is on. Test it using a digital multimeter. Use this wire. Be sure to solder and tape the connection you make.

j9fd3s

i used the radio power and made my own little harness



mike

Pazuzu

No, if you wire things in series, then the amperage is constant, and the voltage is differing (and less than 12V) for each component. If you wire in parallel, each item will see 12V, and the ampareage will vary.

j9fd3s

No, if you wire things in series, then the amperage is constant, and the voltage is differing (and less than 12V) for each component. If you wire in parallel, each item will see 12V, and the ampareage will vary. [/quote]

well if you tap off of one wire its in series, right?

i dont thinkg its a big deal, gauges dont draw a lot of power



mike

Pazuzu

[QUOTE=j9fd3swell if you tap off of one wire its in series, right?

i dont thinkg its a big deal, gauges dont draw a lot of power

mike[/QUOTE]



If you're taping wires off, that's parallel. +12V on one side of the item, ground on the other.

this is just sematics, since we all know how to power things, but I just wanted the original poster to be aware that they need to be in parallel not series, since it makes a HUGE difference.

Nemesis

If you're taping wires off, that's parallel. +12V on one side of the item, ground on the other.

this is just sematics, since we all know how to power things, but I just wanted the original poster to be aware that they need to be in parallel not series, since it makes a HUGE difference. [/quote]

Do you really think someone would wire their gauges like that? Jebus! You should be flogged for even giving anyone the idea.