Genuine Parts 12135037 Multi-Function Diode

I have several older model vehicles. Both With AGM type batteries, however the original electrical system and alternator were designed for the original flooded lead cell acid battery design. This diode is a game changer in improving the performance of the charging system on these older vehicles. So that the AGM battery can fully charge. This diode fits with some very minor modifications . You have to trim away some of the plastic casing around the diode so that it will fit in to the fuse slot correctly . Performs well in my vehicles, 89 & 97 Toyota land Cruisers.

I bought this diode to make repairs to my 25 year old motorcycle. This part could not be found in local automotive stores.

Brand name Diode to replace your Alternator Fuse to enable more voltage charge for AGM Batteries if your vehicle needs to handle the correct charge. The diode needs to be trimmed to fit in the fuse ALT slot. Not all vehicles need this slight voltage adjustment. Check out the U-Tube video on the subject of parasitic voltage draw when installing an AGM Battery.

I installed a Odessey Extreme AGM in my 4runner, my battery voltage monitor never showed anything above 13.8ish while driving, per the manufacturer spec sheet/forums the voltage needs to be 14.5-14.8ish to fully charge AGMs. This GM diode installed in the fuse box that is located in the engine bay has bumped the charging voltage up, and now I mostly see it at 14.5 or a little above, the battery seems to be performing better as well. I will add the original fuse inline for good measure soon.

I had replaced my battery with a agm battery and was getting lower than desired voltage with it. I filed down the sides of this to fit perfectly where my alt-s fuse was. Started with no errors. If you do get an error it's because it is directional specific.

Used in motorhome, plugged it in and made things work.

1998 Toyota 4Runner LimitedX2 AGM BatteryI went from 14.1volts at freeway speed to a consistent 14.7volts. Voltage drops to 14.2 volts at idle.Does exactly what I needed to charge the X2.

2020 4runner. AGM Battery. Now putting out 14.2-14.5 Volts. Just place the Diode AWAY from the driver in the ALT S fuse vs how everyone 2019 and older would do it.