M915 Electrcal grimlins

[R Racing]

There are a few things for you to look at,Look under the dash left of the steering wheel should be a small yellow box. thats the flasher relay. there a common fail item. next check both rear tail lights. the way the internal wiring to the light is horrible and are know to rust thru. ( ask me how I know !! ) Also check your CB's with the the power on and make sure you have power on bothe sides . Some of those have a internal Diode and if installed backwards dont work correctly.

 

[WrightContracting]

My apologies wont happen again.

 

[WrightContracting]

Thanks for the help. I actually have a really great truck. I had to replace the tractor protection air valve, and then this signal thing has come up.

I did have the truck parked on the side of the rd with the flashers on for a couple of hrs, I bed it is possibly that relay.

With this trucks, what tends to be the best place for parts such as the flasher relay? ( I will apologize to you to about the overpost, I didnt learn my way around as well as I should have)

 

[R Racing]

I found a Replacement at NAPA . but any place like that or fleet pride should work.Its a standard 12v unit. On both the trucks I have the relay was melted.Also make sure your Trailer brake lever is all the way up or they won't flash either.

 

[WrightContracting]

That is good to know about the brake lever. Since the trailer brakes weren't working we have been using the lever a lot to test. Whats the main reason for using a 24v system vs a 12?

Any way to test that relay?

 

[R Racing]

The truck is 98 percent 12V the only thing the 24V is for is the starter. the fuel solinoid. and the 24V trailer outlet. Its a dual voltage alternator. The 24V was a Mil standard for these trucks. the relay has a heating element spring that opens after a second or 2 thats what gives you the flash. if you put your hand on it and if its getting 12v and ground you should feel it click. normally there discolored and melted a bit on the case when they go bad. Also they can click but the contacts burn so also check you output. its not a high dollar item. if memory serves me right it was less than $20.00

 

[WrightContracting]

Ill give all this a shot. Thanks so much for the help. I will let you know how it turns out!

 

[WrightContracting]

Great news! It was the napa relay that was needed! Thanks for all of the help! Hopefully the more experienced I get I will be in a position to help others!

Thanks!

 

[R Racing]

Great news Joe ! and sometime post a picture or 2.