Fuse 21

[g.ruff561]

Fuse 21 was blown so I changed the fuse. It blew immediately on contact. Car was not running so short must be constant hot. Fuse 21 is radio, 6 button obc, interior lights, glove box flashlight. Red/green is constant hot. Any ideas on r and r would help. Thanks.

[MrBurgundy]

I'd start by disconnect individual components on that circuit until it doesn't blow.

[jgilber0]

Fuse 21 was blown so I changed the fuse. It blew immediately on contact. Car was not running so short must be constant hot. Fuse 21 is radio, 6 button obc, interior lights, glove box flashlight. Red/green is constant hot. Any ideas on r and r would help. Thanks.

Hey Gary – if it’s an aftermarket radio, I’d start with that wiring first. Most likely to be messed up by some prior owner or installer.

[g.ruff561]

What's up Jgilber? Thanks flor the feedback. Not going to be that easy. The fuse blows immediately with the car off. Thiat means this is a strong short on a constant hot wire. If I jump it it could burn out the componants that is wired to the shortage.

[george graves]

I'd start by disconnect individual components on that circuit until it doesn't blow.

Ditto. Any rain water make its way into your car?

[g.ruff561]

Thanks for the feedback. The first thing I checked was for moisture. I just bought the car 3 months ago in. It was under a tarp for 4 years and looked in pristine condition. Paint, tires, interior, no rust. The only thing I did do was install an aftermarket HU and a euro clock swap. Both worked fine until this weekend. Fuse pops on contact. Definite hard shortage.

For reference Fuse 21 is radio, interior lights, trunk lights, obc.

[george graves]

Power to the interior light relay, also goes to the central locking relay. It also loops into the door for no good reason.

[Mwishlist]

There was a post not long ago about someone blowing 21 when they closed their trunk. Check the trunk light wire that runs along the hinges, it may have broken and be shorting against the body.

If not that, time to start disconnecting everything on that circuit and reconnecting one by one until it blows.

[Cephas]

Any update here? A car sitting under a tarp for 4 years sounds like a nice home for mice...

[g.ruff561]

Turns out it was the 6 button obc connector. I did a euro clock swap. Used the connector that was sent with the clock. Turned out the clock connector was garbage. It was made with computer pins and electrical tape. I ended up pulling the clock and going back to oem 6 button obc.

[Mwishlist]

Turns out it was the 6 button obc connector. I did a euro clock swap. Used the connector that was sent with the clock. Turned out the clock connector was garbage. It was made with computer pins and electrical tape. I ended up pulling the clock and going back to oem 6 button obc.

The actual Euro clock connector is the same connector as the powered side mirrors, if you ever come across a parts car to snag one from.

[audiquattrot]

Turns out it was the 6 button obc connector. I did a euro clock swap. Used the connector that was sent with the clock. Turned out the clock connector was garbage. It was made with computer pins and electrical tape. I ended up pulling the clock and going back to oem 6 button obc.

ditto. When I initially swapped to euro clock, I used a cheap adapter that kept shorting fuse 21. It wasn't until I removed that I noticed it was the cause.

[g.ruff561]

I have the power window connector. A great tutorial would be showing wiring for the euro clock. I have a 6 button obc.

[Mwishlist]

In depth at the link, the wiring basics are directly below:
As you probobly noticed, the OBC harness has about 12 wires, only 4 of those wires are needed to get the euro spec clock working. The analog clock has a number above each pin. They are:

30- Power
31- Ground
58k- Light power
31g- Light ground

On clock harness side cut these wires and connect them:
red/white - Power(constant 12v)
brown - Ground
gray/red -Light power
brown/white - Light ground

Connect wires and reverse order to install panel! Enjoy!

http://garagistic.com/index.php?page=e30-euro-clock-install

[g.ruff561]

Good looking out Mwishlist. Not for nothing but I have a 91 318 6 button obc harness. Could you give the colors on this harness that I would need. I think I am going to just crimp or splice and shrink. I have tried 2 on line available connectors and they both crapped out within a few months. I now have a 4 wire oem clock connector. Thanks.