What wire in my 94 corolla only has current when the engine is on? - Toyota Nation Forum : Toyota Car and Truck Forums

tlong831 · 07-31-2007, 03:37 AM

I got a current tester, and I tested some fuses under my hood of my 94 corolla but none of them seem to only get current when the engine is on... I guess I will have to try the in cabin fuses? what is the best way to tap off one of these fuses?
I need a wire that gets current only when the engine is on to plug into my "battery brain" a device which monitor's battery voltage. thanks for any help.

gasman · 07-31-2007, 03:50 AM

jus find a device that only turns on when engine is on such as blower motor or demister and tap off that. but make sure to check and double check first that it does have voltage to it.

Bitter · 07-31-2007, 09:14 PM

fuel pump

tlong831 · 08-01-2007, 02:50 AM

so off the fuel pump? i dont want to go cutting open wires if i dont need to ? should i just go from the fuse? i think i was going to try to the wiper fuse... but that gets power when I am in ACC.. i dont know if that will mess with a battery brain

Flashmn · 08-01-2007, 11:21 AM

I think black brown wire in the ignition harness... I wouldnt go for the fuel pump.

gasman · 08-02-2007, 04:03 AM

some say that taking anything of off the fuel pump can hurt performance since the fuel pump may not be able to supply enough fuel in extreme cases

TCorolla1990 · 08-02-2007, 10:42 PM

Dont take off the fuel pump, too risky, do as gasman said n take off the demister or sumthing like that, always the safest option to go off a luxuary then the necessities