Join Date: Jun 2010
Location: Grand Island, NY (Between Buffalo and Niagara falls)
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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.
'98 QCSB 4x4 12v , G56 with Valair DD !!! , Full set of gages... 5x.014 DFI injectors, 4k gsk he351 60x60x9, S472 72mmx83mm 1.1 ratio. Twins, 0 plate... Carli 2.0 Suspension, Firestone Air bags.
Last edited by toms73novass; 11-27-2010 at 09:22 PM.