Unit not retaining memory - needs backup power?

RatLabGuy

New member
Hey guys, I have one of the old Gen 1 4Runners ('89), so I'm *hoping* somebody here knows this truck...
My radio will not retain its memory after being off > 5 minutes. 1st thing I checked was the battery coming into teh unit, reads 12+ w/ ignition off as it should. I'm now using a new radio, as I condemned the old one for this very reason. Has done this since I bough the truck 18 mo ago.
So I'm not sure what the deal is, maybe it is technically connected but has very bad connection, and dosn't hold/carry a charge under a load or something? Open to ideas on this...

But anyway, the practical issue here is that I'll probably just tap a new power line for it to bypass the problem.
Anybody know of a good place to tap into? Figure it neds to have a good draw on it... I'm not a fan of messy wiring - is it really difficult to get a line directly to the baattery? I have no idea where the wires go through the firewal on this truck...
 
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most newer car stereos have a 12v "power" supply that is tied into the accesory line and a 12v constant for backup that will read 12v when the car is off. check your stereo manual. no need to run a line to the batt for just a head unit. i think i tied mine into the cig lighter.
 
kuljc - yes, I did. I've talken sample voltages at a bunch of different times.
every now and then, it comes up as only .64 V, then I measure again and it is 12 again... then I think maybe I didn't get good contact on the multimeter leads... or I'm just losing my mind....

mdheft - thanks. that is essentially what I have, although this is not really what I'd consider a "newer" car (15 yo) - aside from the speaker wires, truck has a yellow wire which is this (supposedly) hot/battery wire (slightly heavier gauge too) and a red line, that is tapped to the hot of the cigarette lighter - I'd be curious to know if the truck originally had a different "accessory" wire or not, I don't see one but thsi thing has really been monkeyed with by POs. Dosn't have the cool "dim/light" line coming in for the display, thats a bummer.
I just don't have any confidence in this hot wire, I ran a quick-clamp jumper wire straight to the battery and this fixed the problem.
I guess I'm just looking for a good place to tap in the new line, aside from running all the way theough the firewall and onto the terminal itself (messy messy).
 

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