The Problem
Ive had a particular problem with my Aug 2004 build HK Amp unit for a couple of years now.
The problem started off with whole radio / amp unit occasionaly loosing power - the display vanishing for a few seconds.
The problem got gradually worse happening more often, until the unit completely lost all power.
An inspection inside both the amp & head unit showed no obvious faults - but on inspecting the head units connectors, I found the supply voltage was variable & when measurable was only around 3 volts.
From what I could figure, the wiring wasn't straightforward as the amp seemed to supply the HU with this power, but it had dissappeared somewhere along the way.
I had also tried swapping both the Amp & HU but the problem remained
The Temporary Fix
As a quick bodge / workaround, I simply fed the missing permanent supply with the feed from the ignition switched supply.
I had to also incorporate a switch into this circuit to switch off this feed when the ignition was off, as I found it could confuse rear wiper & alarm into coming on in some circumstances - But it worked.
The Permanent Fix
Earlier Today, I had been been looking around under the drivers footwell carpet for the 'Diode' that connects to the high level brake light - When It fails, the high level light remains permanently on even with the ignition off.
Although I didn't locate the Diode, I did find what seems to have caused the HK amp & HU to loose power.
Just in front of the seat lying next to the wiring loom was a very badly corroded 4- way connector.
I`ll add that the footwell area was also awash with water from an as-yet unidentified leak.
The connector comprised of 4 Red/Brown cables joined in a clear plastic sheath.
As can be seen from the pictures, it was so badly corroded that the cables fell apart when touched & the 'clear' sheath was now green with copper corrosion.
I had to cut the ends back a few inches in order to find some decent copper, but when I rejoined them with a single 'choc block' connector - the radio immediately came into life - bypassing the 'quick fix' isolating switch I had previously installed.
Hope this helps someone with similar problems with their HK amp.
:smile:
Ive had a particular problem with my Aug 2004 build HK Amp unit for a couple of years now.
The problem started off with whole radio / amp unit occasionaly loosing power - the display vanishing for a few seconds.
The problem got gradually worse happening more often, until the unit completely lost all power.
An inspection inside both the amp & head unit showed no obvious faults - but on inspecting the head units connectors, I found the supply voltage was variable & when measurable was only around 3 volts.
From what I could figure, the wiring wasn't straightforward as the amp seemed to supply the HU with this power, but it had dissappeared somewhere along the way.
I had also tried swapping both the Amp & HU but the problem remained
The Temporary Fix
As a quick bodge / workaround, I simply fed the missing permanent supply with the feed from the ignition switched supply.
I had to also incorporate a switch into this circuit to switch off this feed when the ignition was off, as I found it could confuse rear wiper & alarm into coming on in some circumstances - But it worked.
The Permanent Fix
Earlier Today, I had been been looking around under the drivers footwell carpet for the 'Diode' that connects to the high level brake light - When It fails, the high level light remains permanently on even with the ignition off.
Although I didn't locate the Diode, I did find what seems to have caused the HK amp & HU to loose power.
Just in front of the seat lying next to the wiring loom was a very badly corroded 4- way connector.
I`ll add that the footwell area was also awash with water from an as-yet unidentified leak.
The connector comprised of 4 Red/Brown cables joined in a clear plastic sheath.
As can be seen from the pictures, it was so badly corroded that the cables fell apart when touched & the 'clear' sheath was now green with copper corrosion.
I had to cut the ends back a few inches in order to find some decent copper, but when I rejoined them with a single 'choc block' connector - the radio immediately came into life - bypassing the 'quick fix' isolating switch I had previously installed.
Hope this helps someone with similar problems with their HK amp.
:smile: