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Old 11-27-2010, 04:32 PM   #1 (permalink)
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Grid heater relay replacement

Well it has finally gotten cold here and I noticed that the truck was much more difficult to start at 30 degrees. I had my doubts about the grid heaters. I took off the intake and found that one was not getting hot.

Traced it back to a bad relay, all the wiring was fine.

So I know from previous threads that a isolated relay is needed because the computer grounds out the relay to energize it.

Most of the local stores did not have 2 and most of them were $30....

I came home and did a little research and what I came up with was.

The 1985 Jeep J20 with the 5.9l used an isolated starter relay.
The was useful because if you ask may counter guys they just stare at you unless you have a specific model year etc.

Well, according to Advance Autos website they had the two I needed in stock, took my multimeter with me to verify the base was isolated.....

Of course, no go, it was grounded.

I went to Autozone and BINGO! Their part # is AM430 and it IS and isolated base. $12.99

I will post pictures in a bit of how I modded the stock bracket to mount these.

There are 3 little connections two threaded on the bottom and 1 non threaded on the top. The connections you use are the one on the top and the "S" threaded connection to activate the relay. Then of course the two large ones.
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Old 11-27-2010, 05:32 PM   #2 (permalink)
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https://www.surpluscenter.com/home.asp has two or three different isolated ground solenoids for $5.99 each.
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Old 11-27-2010, 08:16 PM   #3 (permalink)
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Bill, I saw you post about those in another thread. If I had been proactive that is probably the route I would have gone.

I did not want to wait since it is my DD and the cold weather is here for a while and wanted to get it fixed today.
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Old 11-27-2010, 08:20 PM   #4 (permalink)
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Here are the update pics.

Took the old bracket apart to reuse part of it:





Then I made up this from a piece of steel I tapped and welded to the original:



Boy these things get hot! You can see me faking out the computer with a 50K Ohm pot so it thinks it like 0 deg out when it was a warm 60 in the shop.

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Old 11-27-2010, 09:35 PM   #5 (permalink)
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holy JEEZE! them things do get RED hot lol. im thinking thats my issue too is a bad relay. thanks for the write up. OH! i total forgot to mention, 82-84 6.2 GM diesels use a isolated relay for their glowplugs too! give one small terminal 12 volts and one a ground and they work. theyre about 10 bucks too, and easy to find at every auto parts store and last a long time.
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Old 11-27-2010, 09:55 PM   #6 (permalink)
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thanks tom and illflem, both of you have helped tremendously. dayum, no wonder the owner's manual say's to not cycle more than once. tom, may i ask what you do for a living?

rande
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Old 11-27-2010, 10:19 PM   #7 (permalink)
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Originally Posted by randemelissa View Post
thanks tom and illflem, both of you have helped tremendously. dayum, no wonder the owner's manual say's to not cycle more than once. tom, may i ask what you do for a living?

rande
I teach HS Technology and pre engineering.
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Old 11-28-2010, 12:11 PM   #8 (permalink)
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I have an intake temp gauge that reads down to 0F with the sensor about half way back on the airhorn.
Even at 0 the gauge jumps up to over 80 in the matter of a couple seconds when the grids cycle.
They do get hot fast...
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Old 02-04-2011, 02:07 PM   #9 (permalink)
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Grid heater relays

I just finished replacing the relays for the grid heater. its totaly wild that the dealer said $100.00 for 2 relays. and 2 weeks to get them. So off to search i went. I think I found a solution. the relays are almost an exact match to a western snow plow. The only differance is westerns are 1 inch taller. all the connections are the same. The mod to the factory bracket was cake. just drilled out he center of the dimpple. cut off the new relays mounting tabs and bent them around the factory bracket. the wires reach just fine, and when you look at them they look factory. the best part is they were $14.95, and you can get them at any truck shop that deals with plows. or online. Direct replacement for Western part # 56131K, Snow plow aftermarket part # 1306310. I will post the pixs later.
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Old 02-04-2011, 05:39 PM   #10 (permalink)
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I installed the ford solenoids on mine. Totally manual control. I used a single momentary on push button switch that branches out to two separate illuminated (when on) switches for each heater.These are mounted on the left side of the steering column. If I just wanna use one heater in not so cold temps- flip one switch, push the button, switch illuminates to let me know power is being sent. Let go button after 10 secs and fire her up. Then I may activate just the other one every now and then while warming up. This wouldn't be for everone tho- I just happen to like full control for some things.
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Old 02-04-2011, 07:23 PM   #11 (permalink)
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Quote:
the relays are almost an exact match to a western snow plow.
Lift gate relays work too.
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