when i crank the engine, radio and gauge go off and back on

bzbuzz · 06-29-2008, 06:14 PM

hi,

i have an alpine and defi racer gauges...
how come when i crank/start the engine, they go off instantly and come back on rite away? is this normal?

jrdriller · 06-29-2008, 06:18 PM

your radio and gauges are connected to a switched power supply. this is normal. you do not want the radio or other aux equipment on while the engine is cranking/starting.

cheers

bzbuzz · 06-29-2008, 06:36 PM

really? but sometimes they stayed on tho...most of time go off..

wi77iam · 06-30-2008, 03:05 AM

The gauge and radio are not on a switched circuit. Your battery isn't supplying enough amps sometimes to power them during the crank. You can try a voltage regulator, or a nice big capacitor, or a tank circuit. Or just buy a new battery.

bzbuzz · 06-30-2008, 08:20 AM

my battery and alternator should be fine tho..
i checked the battery when car is off it is 12.9v and when cars at idle..it is 14.5

Rootus · 06-30-2008, 04:19 PM

Normal for the radio, but for the gauges it means you're tapped into the wrong power source. Try tapping into the power for the hazard button. Search on here for details, it's a regularly occurring installation mistake.

jrdriller · 07-01-2008, 04:35 AM

this might help

Gauge Installation Electrical Wiring Tips and Pics Defi and Others - NASIOC

cheers

bzbuzz · 07-01-2008, 10:30 AM

Quote:

Originally Posted by jrdriller

this might help

Gauge Installation Electrical Wiring Tips and Pics Defi and Others - NASIOC

cheers

I wired gauges based on that nasioc thread.

**torquemada** · 07-01-2008, 10:44 AM

Quote:

Originally Posted by bzbuzz

hi,

i have an alpine and defi racer gauges...
how come when i crank/start the engine, they go off instantly and come back on rite away? is this normal?

same radio and same gauges (bf) same behaviour

bzbuzz · 07-01-2008, 01:02 PM

it seems like when you start the engine all(?) accessories go power off instantly to give enuf current for starter...so my alpine restarts and defi does sweep again....
i am still wondering if there is a way to have defi stayed on even if start the engine..

Rootus · 07-01-2008, 02:15 PM

Quote:

Originally Posted by bzbuzz

it seems like when you start the engine all(?) accessories go power off instantly to give enuf current for starter...so my alpine restarts and defi does sweep again....
i am still wondering if there is a way to have defi stayed on even if start the engine..

Did you not read what I wrote? Do you need this handed to you on a silver platter?

defi wiring help!

bzbuzz · 07-02-2008, 06:46 AM

Quote:

Originally Posted by Rootus

Did you not read what I wrote? Do you need this handed to you on a silver platter?

defi wiring help!

I did read it and didn't like it since i checked the schematic and it seems like that black/green wire on the hazard goes to the ignition relay instead of being fed directly from the power supply(i am using ign on the a/c harness). and it doesnt look like the wire is active when the harzard is on...did u try?

bzbuzz · 07-02-2008, 06:55 AM

after researching, my conclusion is that I dont think there is a way to make my defi's stayed on when i crank engine since i can't find solid 12v line that always hot. like i said eariler, all 12v lines drops when engine starts. this is not the issue w/ ign wire, but 12v line.

Rootus · 07-02-2008, 02:10 PM

Quote:

Originally Posted by bzbuzz

I did read it and didn't like it since i checked the schematic and it seems like that black/green wire on the hazard goes to the ignition relay instead of being fed directly from the power supply(i am using ign on the a/c harness). and it doesnt look like the wire is active when the harzard is on...did u try?

This is how I set up my Defis. And they turned on with the ignition, and did not turn off and back on again with the key turned to start. It's a really common issue, with a really easy solution. My favorite kind of problem

.

bzbuzz · 07-02-2008, 04:51 PM

Quote:

Originally Posted by Rootus

This is how I set up my Defis. And they turned on with the ignition, and did not turn off and back on again with the key turned to start. It's a really common issue, with a really easy solution. My favorite kind of problem

.

let me ask you this..
so let' say your key is on 2nd position, your defi sweeps...and you start your engine..it doesnt sweep again?

06-29-2008, 06:14 PM	#1
bzbuzz STI Driver Car: 06 wrx ltd vf34 Fav Mod: JTAG Location: IL Posts: 244 Join Date: Dec 2006 Trader Rating: (1)	when i crank the engine, radio and gauge go off and back on hi, i have an alpine and defi racer gauges... how come when i crank/start the engine, they go off instantly and come back on rite away? is this normal? This ad is not endorsed by this member. Please register or login to hide this ad.

06-29-2008, 06:18 PM	#2
jrdriller Junior STI Driver Car: Silver 08 STI Fav Mod: Coming Soon Location: Houston Posts: 189 Join Date: Apr 2008 Trader Rating: (0)	Re: when i crank the engine, radio and gauge go off and back on your radio and gauges are connected to a switched power supply. this is normal. you do not want the radio or other aux equipment on while the engine is cranking/starting. cheers

06-29-2008, 06:36 PM	#3
bzbuzz STI Driver Car: 06 wrx ltd vf34 Fav Mod: JTAG Location: IL Posts: 244 Join Date: Dec 2006 Trader Rating: (1)	Re: when i crank the engine, radio and gauge go off and back on really? but sometimes they stayed on tho...most of time go off..

06-30-2008, 03:05 AM	#4
wi77iam Grassroots STI Racer Car: 04 PSM STi Location: Hatfield, PA Posts: 566 Join Date: May 2003 Trader Rating: (2)	Re: when i crank the engine, radio and gauge go off and back on The gauge and radio are not on a switched circuit. Your battery isn't supplying enough amps sometimes to power them during the crank. You can try a voltage regulator, or a nice big capacitor, or a tank circuit. Or just buy a new battery.

06-30-2008, 08:20 AM	#5
bzbuzz STI Driver Car: 06 wrx ltd vf34 Fav Mod: JTAG Location: IL Posts: 244 Join Date: Dec 2006 Trader Rating: (1)	Re: when i crank the engine, radio and gauge go off and back on my battery and alternator should be fine tho.. i checked the battery when car is off it is 12.9v and when cars at idle..it is 14.5

06-30-2008, 04:19 PM	#6
Rootus S204 Racer Location: Mahan, OR Posts: 2,905 Join Date: Sep 2005 Trader Rating: (1)	Re: when i crank the engine, radio and gauge go off and back on Normal for the radio, but for the gauges it means you're tapped into the wrong power source. Try tapping into the power for the hazard button. Search on here for details, it's a regularly occurring installation mistake.

07-01-2008, 04:35 AM	#7
jrdriller Junior STI Driver Car: Silver 08 STI Fav Mod: Coming Soon Location: Houston Posts: 189 Join Date: Apr 2008 Trader Rating: (0)	Re: when i crank the engine, radio and gauge go off and back on this might help Gauge Installation Electrical Wiring Tips and Pics Defi and Others - NASIOC cheers

07-01-2008, 01:02 PM	#10
bzbuzz STI Driver Car: 06 wrx ltd vf34 Fav Mod: JTAG Location: IL Posts: 244 Join Date: Dec 2006 Trader Rating: (1)	Re: when i crank the engine, radio and gauge go off and back on it seems like when you start the engine all(?) accessories go power off instantly to give enuf current for starter...so my alpine restarts and defi does sweep again.... i am still wondering if there is a way to have defi stayed on even if start the engine..

07-02-2008, 06:55 AM	#13
bzbuzz STI Driver Car: 06 wrx ltd vf34 Fav Mod: JTAG Location: IL Posts: 244 Join Date: Dec 2006 Trader Rating: (1)	Re: when i crank the engine, radio and gauge go off and back on after researching, my conclusion is that I dont think there is a way to make my defi's stayed on when i crank engine since i can't find solid 12v line that always hot. like i said eariler, all 12v lines drops when engine starts. this is not the issue w/ ign wire, but 12v line.