[MYZOOK]

Hi All,

I've just finished my G13B conversion and have a problem with my Tacho.

It only works when the heater fan is turned on ???

I've picked up the signal from the engine bay. It is definitley connected to the correct wire, just don't understand why it only works when the blower fan is turned on.

Any help would be much appreciated.

Cheers,
Daniel

[royce]

where did you get power and earth for the tacho from?

[Rusho]

How is it wired, the positive feed I mean. Is it possible that the tacho's +ve supply is coming from the switch side of the fan? Just a thought. I hate auto electrics..... Did it work before?? I assume it did.

[steak_knife]

Rusho81 wrote:

How is it wired, the positive feed I mean. Is it possible that the tacho's +ve supply is coming from the switch side of the fan? Just a thought. I hate auto electrics..... Did it work before?? I assume it did.

Tacho's are a NEG pulse, normally from neg of coil, other's the Ecu give's ect ect ect

[joeblow]

tacho for a sierra is brown wire comming from the noise supressor.

[Rusho]

I meant the +ve wire that powers the tacho, not the pulse wire. Only because he said it works when the fan is on

[steak_knife]

Rusho81 wrote:

I meant the +ve wire that powers the tacho, not the pulse wire. Only because he said it works when the fan is on

Yep, Rito Rusho.

Sorry mate, my mistake.

[MYZOOK]

It's the factory tachometer and I'm using the negative feed from the ecu going to the original negative tachometer feed. I don't think the +ve would be connected to the heater blower fan unless they do that from the factory.

[Rusho]

Short in wires somewhere??

[steak_knife]

MYZOOK wrote:

It's the factory tachometer and I'm using the negative feed from the ecu going to the original negative tachometer feed. I don't think the +ve would be connected to the heater blower fan unless they do that from the factory.

This may sound a bit silly, but, did you do ANYTHING else to the car at the same time as the conversion?
Where did you get your power from for the ECU?
It has to be some thing you've done, just go back & looky.

Try pulling the fuse for the fan(blower) & see if the eng still run's.

[MYZOOK]

All power wires are from the battrery via switched relays. Car runs fine. It's just that the tacho doesn't work.

[coilyzook]

saam had a problem with his original tacho in his coily,
pm him and he might be able to help

[Rusho]

Stuffed relay? Poor earth on relay? Fuse blown on relay?

[Scrawny]

You guys are trying to confuse the poor bugger with all this technical speak... just leave the fan on, problem fixed

[v.w.dave]

ScrawnC wrote:

You guys are trying to confuse the poor bugger with all this technical speak... just leave the fan on, problem fixed

HAHAHA nice and simple ..... The question I have is how in the world did you figure out it was the heater fan that when turned on, It works??? At what point in the last week have you needed a heater in Sydney? Its been 28 + for over a week.