Help Car wont start after headunit install - Page 2 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Brenner41 · 08-18-2022, 08:03 PM

Just to close this thread. I ended up taking it to my mechanic and it turns out there was some corrosion on the battery terminals that they cleared up and started fine after that. I installed the head unit after and was all good. The car never had a problem starting before but I guess it tipped it over the edge with this install.

Thanks all for the help, great community.

soundman98 · 08-18-2022, 08:43 PM

goes to show, always check the simple stuff first!

soundman98 · 08-18-2022, 08:46 PM

Quote:

Originally Posted by Trollhart

Another thought: Do you have a wiring diagram for the Radar Detector? You said the wiring was shoddy, so there might have been some mysterious connection keeping the car alive?

Sadly I have no idea how these things are supposed to be wired, since Radar is not used in my country and any detection stuff is highly illegal anyway.

Assume it needs at least 12V power source and a ground (which might have been compromised during the removal)?

radar detectors are generally wired exactly the same as dash cameras. there's usually a barrel jack input. that barrel jack is normally wired to switched/acceessory power so it comes on when the car comes on, and shuts off with the car.

really simple devices. but there's no telling what happens with some people's wiring methods

FR-S2GT86 · 08-19-2022, 06:01 AM

Quote:

Originally Posted by Brenner41

Just to close this thread. I ended up taking it to my mechanic and it turns out there was some corrosion on the battery terminals that they cleared up and started fine after that. I installed the head unit after and was all good. The car never had a problem starting before but I guess it tipped it over the edge with this install.

Thanks all for the help, great community.

This also proves that there are different procedures for measuring battery voltage at the battery. Battery posts versus battery terminals.

Tcoat · 08-19-2022, 09:06 AM

Quote:

Originally Posted by soundman98

goes to show, always check the simple stuff first!

At least he didn't replace his alternator and starter like so many have!

Power to connections to components is the simple order

The more complex is:

soundman98 · 08-19-2022, 10:49 PM

oh, the good old days where coil-on-plug didn't exist, and starter solenoids were easy to jump with a screwdriver...

08-18-2022, 08:43 PM	#16
soundman98 ProCrastinationConsultant Join Date: Sep 2013 Drives: '14 Ranger, '18 Tacoma 4Dr LB Location: chicago-ish Posts: 11,330 Thanks: 35,240 Thanked 13,675 Times in 6,782 Posts Mentioned: 98 Post(s) Tagged: 0 Thread(s)	goes to show, always check the simple stuff first! __________________ "The time you enjoy wasting is not wasted time"

08-19-2022, 10:49 PM	#20
soundman98 ProCrastinationConsultant Join Date: Sep 2013 Drives: '14 Ranger, '18 Tacoma 4Dr LB Location: chicago-ish Posts: 11,330 Thanks: 35,240 Thanked 13,675 Times in 6,782 Posts Mentioned: 98 Post(s) Tagged: 0 Thread(s)	oh, the good old days where coil-on-plug didn't exist, and starter solenoids were easy to jump with a screwdriver... __________________ "The time you enjoy wasting is not wasted time"

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08-18-2022, 08:03 PM	#15
Brenner41 Junior Member Join Date: Aug 2022 Drives: 2013 Scion FRS Location: ON, Canada Posts: 7 Thanks: 0 Thanked 3 Times in 1 Post Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Just to close this thread. I ended up taking it to my mechanic and it turns out there was some corrosion on the battery terminals that they cleared up and started fine after that. I installed the head unit after and was all good. The car never had a problem starting before but I guess it tipped it over the edge with this install. Thanks all for the help, great community.

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