96 nissan altima isolation relay

Ive seen some places online saying i need to isolate the accessory wire in my 96 altima.
Most diagrams look like this: Link

However, when i wired this according to the diagram, i had about +2.5 v on my accessory wire even with no key in the ignition with the white wire(86) connected to the ignition. If i read that wire before connecting the relay to the ignition, it reads +12v which i assume is coming from (85). If i test the ignition wire without the relay connected, that wire reads 0v until the key is 'on' or 'acc'. The +12v constant wires i used were at the ignition switch (87+85) and i cut the accessory wire (R to Bk/P) and wired according to the diagram (key side at 87a, blower side at 30).

Looking at the diagram i would think the accessory wire is disabled unless the ignition is activated, but because i have this +2.5v from somewhere the relay is always energized (which is draining my battery because the blower always has power and is running).

Most things i have read say that without the relay the starter should grind or the remote start will not work. I, however, tried wiring it without the relay and everything seems to function normally. No grinding and its starting fine, even in cold weather. The blower does not have power constantly and it doesnt have power while the car cranks. Once the car is started, the radio and blower both work fine. I then used the same relay for the parking lights and its working fine there so i dont think its an issue with the relay.

Not sure if this particular remote start (Alert 650r) doesnt require a relay for the Acc wire, or if i am just doing something incorrect. If someone with a little more relay experience could show me what i did or didnt wrong. Its working with no relay for now but i dont want to kill my starter in a few months because im not isolating that accessory wire, thanks

featherking wrote:

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However, when i wired this according to the diagram, i had about +2.5 v on my accessory wire even with no key in the ignition with the white wire(86) connected to the ignition. If i read that wire before connecting the relay to the ignition, it reads +12v which i assume is coming from (85). If i test the ignition wire without the relay connected, that wire reads 0v until the key is 'on' or 'acc'. The +12v constant wires i used were at the ignition switch (87+85) and i cut the accessory wire (R to Bk/P) and wired according to the diagram (key side at 87a, blower side at 30).

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it sounds like your saying you connected 86 to an ignition wire?

86 is supposed to be connected to a negative output from the remote start unit only. one that only comes on when the unit is remote started.

Ah,

So in this Alert 650r there is a wire:

"H8/1 Blue/Black (Ignition 3 Output)
This wire provides a 200mA (-) negative ground output that becomes active 4 seconds before the remote start unit initializes, and remains grounded while running."

So if i connect this wire to (86), it would energize 86 and 85 only 4 seconds before the remote start initializes (which gives accessory power) and stays grounded while running (keeping power to the blower)

I also have an accessory wire for the radio, would i need to isolate this wire with its own relay or is it possible to use the same relay as the blower? on that note, is there any way to tell when you would need to isolate a wire? via DMM or other means?

yes that H8/1 is the wire you need. and you dont have to do anything with the wire at the radio, only the one in the ignition harness.

Excellent, thanks so much for your help