Hey guys,
I just put an old Kenwood KRC-773 HU and a 10 stacker in my car, I Set all the stations, equal and fad/bal etc however when I turn the car off all the memory is lost...I just put a new battery in it two days ago so I don't think memory power is an issue(unless I wired it wrong...it was a nightmare install!) but I thought if the 'memory' wire wasn't hooked up the unit wouldn't function at all? There was three wires left over a pink, a blue and a blue with a stripe..the blue one had a tag saying power antenna, so thats cool..Anyway any help would be appreciated...it is a second hand unit so it could just be a system fault! FROWN
Cheers in advance..
Replies (4)
trunkisloud on 08/14/2007 22:37:20
sounds like you have the constant hot (yellow wire) and the switched hot (red) backwards.....try switchin em around.
swez on 08/15/2007 06:47:51
Right, the Yellow wire needs to have a constant 12 volt supply to retain memory functions. The Red wire is a switched circuit that is often tapped into the ACC/IGN circuit. There is no power on the Red lead until the key is inserted and the ignition switch is set to ACC or after the motor is running.
Also, ground the HU to a bare metal location in the dash, floor pan or firewall. Do not use the factory dash ground wire for the HU.
Swez
Blue is for Power antenna
Blue w/ stripe is for remote power amp turn on
Pink (I dunno... do you have the install manual for this HU?)
paz on 08/16/2007 07:48:40
Yeah its sorted now, I had the wires crossed over when I made up the final harness. No its a second hand unit so I don't have the manual....but I think the pink is dimmer which I'm not using so thats cool.
I've heard this before, why do you recommend Earthing to the car body instead of the harness?
The only problem I've got now is a loose antenna connection....I bought a new antenna after the old electric one got wiped out by a bored teenager in a car park:( Anyway the connection on the new one is loose..I tried using some alluminium foil to wedge it in tighter but its not a very good contact...ideas?
Cheers..
swez on 08/16/2007 10:16:43
Aftermarket HU's draw more power than most stock units and work best with independent grounds as mentioned. Most aftermarket HU makers will state using a dedicated ground in their install manuals for better noise rejection too. (Avoid ground loops = no engine noise intrusion)
Antenna misfit? Some antenna plugs have small metal tabs on the grounding shaft part of the plug that can be slightly spread out for a tighter fit. If yours does not have this feature, either need an antenna adapter that does fit or modify what you have.
Aluminum foil is a poor conductor. Depending on the amount of slop you have to make up for, I would probably try a spiral wrap of bare copper wire around the grounding shaft of the plug. (#22 gage) stranded wire with insulation removed, might do the trick.
Swez
I just put an old Kenwood KRC-773 HU and a 10 stacker in my car, I Set all the stations, equal and fad/bal etc however when I turn the car off all the memory is lost...I just put a new battery in it two days ago so I don't think memory power is an issue(unless I wired it wrong...it was a nightmare install!) but I thought if the 'memory' wire wasn't hooked up the unit wouldn't function at all? There was three wires left over a pink, a blue and a blue with a stripe..the blue one had a tag saying power antenna, so thats cool..Anyway any help would be appreciated...it is a second hand unit so it could just be a system fault! FROWN
Cheers in advance..
Replies (4)
trunkisloud on 08/14/2007 22:37:20
sounds like you have the constant hot (yellow wire) and the switched hot (red) backwards.....try switchin em around.
swez on 08/15/2007 06:47:51
Right, the Yellow wire needs to have a constant 12 volt supply to retain memory functions. The Red wire is a switched circuit that is often tapped into the ACC/IGN circuit. There is no power on the Red lead until the key is inserted and the ignition switch is set to ACC or after the motor is running.
Also, ground the HU to a bare metal location in the dash, floor pan or firewall. Do not use the factory dash ground wire for the HU.
Swez
Blue is for Power antenna
Blue w/ stripe is for remote power amp turn on
Pink (I dunno... do you have the install manual for this HU?)
paz on 08/16/2007 07:48:40
Yeah its sorted now, I had the wires crossed over when I made up the final harness. No its a second hand unit so I don't have the manual....but I think the pink is dimmer which I'm not using so thats cool.
I've heard this before, why do you recommend Earthing to the car body instead of the harness?
The only problem I've got now is a loose antenna connection....I bought a new antenna after the old electric one got wiped out by a bored teenager in a car park:( Anyway the connection on the new one is loose..I tried using some alluminium foil to wedge it in tighter but its not a very good contact...ideas?
Cheers..
swez on 08/16/2007 10:16:43
Aftermarket HU's draw more power than most stock units and work best with independent grounds as mentioned. Most aftermarket HU makers will state using a dedicated ground in their install manuals for better noise rejection too. (Avoid ground loops = no engine noise intrusion)
Antenna misfit? Some antenna plugs have small metal tabs on the grounding shaft part of the plug that can be slightly spread out for a tighter fit. If yours does not have this feature, either need an antenna adapter that does fit or modify what you have.
Aluminum foil is a poor conductor. Depending on the amount of slop you have to make up for, I would probably try a spiral wrap of bare copper wire around the grounding shaft of the plug. (#22 gage) stranded wire with insulation removed, might do the trick.
Swez
Copyright ClubKnowledge 2009 * All Rights Reserved
