NFR Keeping mice out of the engine compartment...

Non-fishing related
Bryan, I have a 12' x 30' carport at the end of the house that provides plenty of structure to hang a light from. I have one of those extension cords that has a metal cage on the end to hold a bulb and a hook for hanging it. It bathes the whole area in light and really seems to suppress nighttime traffic.

Freestone is spending a few days with me and has been living in her RV for several weeks. Last week she had a mouse in it somewhere that was difficult to remove so she used some flashing LED's on the ground and a luminAID lantern under the hood. Her LED's are powered by a solar charged power brick which can also be charged via USB. With the lights around her rig she should be safe from rodents and with all the food removed from inside there should be no bear problems either.

Some of the new RV's are being built with lights underneath that repel rodents but at this point are probably only being used on high end products, it will take awhile before they become mainstream. But anyone that understands how a flashlight or Christmas lights work should be able to cobble something together that will light the underneath of a vehicle. I bought 2 LED's and mounted them under the hood and hooked them to the battery through an illuminated rocker switch. They are only 1.6 watts but really light up the engine compartment and draw very little power. I tried several of the methods mentioned here but in the main they required some effort on my part to keep them active and I often forgot. Once I determined that light was a great deterrent, keeping rodents away became as easy as flipping a switch.

After a particularly vexing visit by a chipmunk on the Big Horn a few years ago I found a battery powered flashing light that I placed under the engine at night. It seemed to work but needed new batteries after just 3 nights. Then I discovered the luminAID and that is much better and brighter. Over the years I have been plagued by pack rats, mice, chipmunks, squirrels, a woodchuck and a white mink. A .22 air pistol has eliminated 3 of them but getting a clean shot is a rarity but very satisfying.
 
When the mice/rats got under the hood of my PU and chewed the coating off the steel throttle cable I got a small package of the green bait blocks , about $10, and wired one under it under the hood. Eliminated the problem from the truck and yard around house.
 
I appreciate all these non-toxic solutions like lights. Those rodenticides in the poison baits are pretty nasty and can wreak unintentional havoc like when a predator or scavenger eats the poisoned rodent and gets secondary poisoning. This can be dogs, birds of prey, and other critters we probably don't want to harm unintentionally. I 100% get wanting to protect your stuff but it's good to be aware of possible unintended consequences from poison baits, and adopt safer alternatives when they're available.
 
There is worse than driving down the road, only to have a mouse pop out from under the hood to play stuntman on your windshield. Oh, there is something worse, a $2,500 quote to replace my chewed wiring harness! I have used red pepper flakes in the past. Seems to work but needs frequent refreshes.
Laughing at the thought of a mouse playing stuntman on a vehicle windshield! 😆
 
FWIW, I installed this (from Amazon) almost two years ago & it's "worked" so far:

Under Hood Animal Car Repeller Rodent Electronic Repellent Ultra Sonic Rat Strobe Light Keep Mice Away from Car Pest Prevention for 12V 24V Automobile.​

I've heard it sound off a couple of times since the easy/quick install.
 
Laughing at the thought of a mouse playing stuntman on a vehicle windshield! 😆

It’s happened more than once.

You’d laugh even louder if you heard my shriek the time it happened when it was still dark. All I saw was the silhouette of the mouse walking across my wipers, which at first, made it look like it was walking across my dash inside my truck :).

Edit: another thing to look out for if you are getting mice in your engine compartment is them getting in the cab of your vehicle. Happened with my 2017 Tundra when I left it idle for two weeks while out of town. Nice, mice turds in the center console. They got in through the air intakes of my which the dealer fixed by covering the intakes with wire mesh. Frustrating because I’ve read a lot of these issues are caused by auto makers using soy based plastic coverings. Not sure if that’s an auto thing or wiring thing in general but for vehicles it seems to be an open buffet for any rodent. This issue pops up periodically about DIA.

 
Last edited:
I know someone who sprays peppermint oil and has had success. This was after a very expensive cleanout procedure on a nearly new truck.
 
Bryan, I have a 12' x 30' carport at the end of the house that provides plenty of structure to hang a light from. I have one of those extension cords that has a metal cage on the end to hold a bulb and a hook for hanging it. It bathes the whole area in light and really seems to suppress nighttime traffic.

Freestone is spending a few days with me and has been living in her RV for several weeks. Last week she had a mouse in it somewhere that was difficult to remove so she used some flashing LED's on the ground and a luminAID lantern under the hood. Her LED's are powered by a solar charged power brick which can also be charged via USB. With the lights around her rig she should be safe from rodents and with all the food removed from inside there should be no bear problems either.

Some of the new RV's are being built with lights underneath that repel rodents but at this point are probably only being used on high end products, it will take awhile before they become mainstream. But anyone that understands how a flashlight or Christmas lights work should be able to cobble something together that will light the underneath of a vehicle. I bought 2 LED's and mounted them under the hood and hooked them to the battery through an illuminated rocker switch. They are only 1.6 watts but really light up the engine compartment and draw very little power. I tried several of the methods mentioned here but in the main they required some effort on my part to keep them active and I often forgot. Once I determined that light was a great deterrent, keeping rodents away became as easy as flipping a switch.

After a particularly vexing visit by a chipmunk on the Big Horn a few years ago I found a battery powered flashing light that I placed under the engine at night. It seemed to work but needed new batteries after just 3 nights. Then I discovered the luminAID and that is much better and brighter. Over the years I have been plagued by pack rats, mice, chipmunks, squirrels, a woodchuck and a white mink. A .22 air pistol has eliminated 3 of them but getting a clean shot is a rarity but very satisfying.
Thank you, Ive.

Cheers,
 
I ended up grabbing some of this Tomcat spray stuff and sprayed it around the engine bay. Smelled pretty nice. We shall see if it works.


1730426465271.png
 
Mostly, but I wrapped some around the hoses and battery box area on my p/u and haven't had an issue. Haven't seen that spray you bought, that might have interesting applications.
 
My wires got munched in a new truck. Ouch! No warranty on that. Mechanic says it is very common with the newer soy based wire insulation. They recommend stinky dryer sheets zip tied around the engine. I've done that with no new problems to report...
 
My wires got munched in a new truck. Ouch! No warranty on that. Mechanic says it is very common with the newer soy based wire insulation. They recommend stinky dryer sheets zip tied around the engine. I've done that with no new problems to report...
Ugh... vegans
 
Back
Top