This is the one that I used:
EF32RLNP LED Compatible Turn Signal Flasher Relay
http://smile.amazon.com/dp/B01GIU9M0Y
Still working OK after four years...
>Just get an LED flasher and do it right. It will have a separate ground wire.
>________________________________
>From: Jim Kanomata
>Sent: Sunday, August 22, 2021 4:06 PM
>To: gmclist
>Subject: [GMCnet] Re: All Turn lights changed to LED
>
>There are resistors just for that application, find it at any auto parts of
>call us.
>
>
> > An incandescent dashboard light is still needed for enough resistance to
> > make the flash work. Todd spent about 2 hours running through all the
> > wiring to figure that out.
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>
>--
>Jim Kanomata ASE
>Applied/GMC, Newark,CA
>jimk
>
http://www.gmcrvparts.com
>1-800-752-7502
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Dave
Ann Arbor, MI.
73 Sequoia (26'/455/EbH/RwI/ThH/HEI/TBI/160°/3.42/100A/Q55G)
99 Gillig 36' Low Floor Bus (work in progress)