Hcu

[Andrej]

Volvo penta d4 port side instruments no display and no ignition

 

[jrudge]

Power would be the most obvious starting point.

If you have checked that and that connectors are connected then swap hcu and see if the fault moves with it.

 

[Sticky Fingers]

Port side engine start battery, or the port engine breaker would be good place to start.

 

[Andrej]

No power to to live feed on the ignition switch batteries good all connections and breakers ok had a new pcu 2 years ago ,I have looked for the hcu to no avail fearing it could be the helm station .

 

[jrudge]

So sort live feed to the ignition ...

 

[Andrej]

Well tried to trace red wire but a needle in a haystack would be easier, Volvo engines have been a nightmare for the past decade every year major expense.

 

[jrudge]

To test just give it a feed from the other ignition. If it works then you know the problem you need to solve.

 

[madabouttheboat]

The HCUs are usually mounted together, so its very easy to swap connections from 1 to the other. This should rule in or out an HCU issue.

 

[Andrej]

Looking at the photos of the hcu I don’t have anything that looks like them ,so I am thinking my hcu s are in the throttle control fear of god the price if they are.

 

[Andyroonot]

No power to to live feed on the ignition switch batteries good all connections and breakers ok had a new pcu 2 years ago ,I have looked for the hcu to no avail fearing it could be the helm station .

Switch the Datalink cable from port HCU to STB’D and vice-versa
You’ll get some alarms due to the chassis ID conflict but if the stb’d side key switch starts the port engine then the port side PCU and Datalink cable can be assumed to be OK
The ignition live feed (red) comes from the HCU, and so if there is no power on the red wire then either the HCU isn’t getting power (for which you could then check the Datalink cable which has two reds and two blacks), or the HCU is not supplying power to the red ignition wire.

Where are you based?