Grid heater relays

[DBohl]

Does anyone know the cummins part # for the grid heater relays? One of them is starting to melt on my sons truck ( 91. 5 ) Also , do they come as a set or can they be bought individually. How much money is he looking at to fix ? Thanks, Doug

 

[Philip]

I have never seen a cummins part number for the grid heater relays.



The orginal Dodge # is 4428102. But these relays went NS1 about 4 years ago.



The relays were made by White Rogers. Their # is 120-105111-1. This relay will not show in a White Roger catalog. But if you can find a dealer they can cross and give you a number that will work.



We used to have a thread in the Discontinued Parts section. But it has disapeared. Plus with the forum software change a while back the search function is about worthless now.



I hope someone still has the number written down and posts it.



I went and did a little searching. Looks like stancor # 120-901 is the one you need. This a type 4 terminal (isolated coil) with a standard mount. It has silver contacts in the relay. Here is a link with the relay spec's. It is in PDF format.



http://www.stancor.com/wrdstc/pdfs/Catalog_2006/Pg_052_53.pdf





BTW White Rogers is a division of Stancor

 

[Jim Fulmer]

Check this thread out, I did mine after the relays got weak and it worked great.



Jim



http://www.tdr1.com/forums/showthread.php?t=124484&highlight=grid+heaters+relay

 

[Philip]

Jim why did you use a 15 volt coil model #.

 

[jdross440]

Check out this address: http://www.12voltguy.com/catalog.0.html41.0.html

They show a picture of the relay and it's cost is really reasonable: $36. 99 plus shipping.

 

[Jim Fulmer]

DBohl, to tell you the truth I really can't remember which relay's I used, I just know that I put them in a year and a half ago and haven't one issue with them, and belive me my low compression motor doesn't like to start when it's cold without them.



Jim

 

[Paychk]

We used to have a thread in the Discontinued Parts section. But it has disapeared. Plus with the forum software change a while back the search function is about worthless now.

Does this look familiar?

https://www.turbodieselregister.com/forums/showthread.php?t=61131&highlight=4428102

Heres another:

https://www.turbodieselregister.com/forums/showthread.php?p=543142&highlight=120-901#post543142

Some more help:

https://www.turbodieselregister.com/forums/search.php?searchid=2032713

 

[DBohl]

Thanks for all the replies, it seems that the correct part is white rodgers 120-901 I'm going to order a pair of them today. I will post again to keep you all informed when we get them in the truck Thanks, Doug Jim, thanks for the old posts, alot of good info in them. I should mention that I'm ordering the relays from Allied Elec.com (Ft Worth TX ) 1-800-433-5700 . Philip, thanks for taking the time to do some reaserch as well. Doug

 

[DBohl]

Paychk, Didn't mean to leave you out, I found alot great stuff in your links as well . Thanks again everyone, Doug

 

[Paychk]

Paychk, Didn't mean to leave you out, I found alot great stuff in your links as well . Thanks again everyone, Doug

No worries... its all about helping!

 

[PToombs]

Hey Paychk, welcome back! I've missed your timely search help!

 

[Paychk]

Thank You



I don't have a lot of free time since the move home... but I like to help as much as I can.

 

[Hunter4x4]

While we're talking about grid heaters and relays, I noticed this winter that my grid heaters are drawing a little more juice than they did in the past - is this 'cuz of the relays (getting old?) or is something else in play that I should be aware of?



As always, thanks for any input!!!



Mike

 

[phillips5]

Batterys get weak over there life and then they produce less voltage under load. The lower the voltage the higher the amps.

 

[Hunter4x4]

Brand new battery... . and where I used to see the factory IP volt gage at the 'top' edge of the lowest mark on the scale it's now a little 'below' that mark when we turn on the ignition on a cold truck.



So again, it looks like I'm seeing a little more current draw (evidenced by the lower voltage, i. e. , higer amp load) on the grid heaters than I did in the past. So since we were talking about relays and what they do when they get old, I was wondering could it be bad/old relays causing the increased current draw in my truck or shold I look elsewhere?



Thanks!

 

[JLEONARD]

Could be a little corrosion at the connections. Clean and reinstall and see if it changes. It can't hurt. Might be inside the crimp connection too.



EDIT: That includes the grounds too.

 

[RDHamill]

When I had to replace my grid heater relays, I went to visit NAPA and got a couple of Ford starter solenoids. The were only about $14 each and are heavier than needed. They have been working fine for a couple of years now.

 

[DBohl]

Well, the relays arrived yesterday (monday) and my son installed them on his truck, They are the same OEM part for alot less money. Dodge dealer gets $70 for the pair. Allied electric gets $16. 19 each and will sell them seperatly. As Philip mentioned above, it is a stancor part# 120-901, you can order online from www.alliedelec.com or call 1-800-433-5700 . They are in Fort Worth TX and shipped the relays UPS . Took three days from start to finish, very happy with the results. Hope this info helps someone. thanks for all the help guys, Doug

 

[Philip]

Glad to hear you have it up and running.



The reason I know the Dodge and White Rogers numbers is I had a grid heater relay stick in the closed position about 5 years ago. At that time Dodge only had 3 left in stock. I bought all 3. Two are setting on a self waiting for when I lose another one. These replacements has the White Rogers tag still on them.

 

[DBohl]

I did find another company that sells the relay called Carlton-Bates they quoted me a price of $12. 85 each . But I think they only sell to other companies. I am waiting on a phone call to get more information and will post my findings. Doug